{"title":"Gas Servos \u0026 Components","description":null,"products":[{"product_id":"intermediate-servo-sleeve-kit","title":"Intermediate Servo Sleeve Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eIn GM TH350 and TH350C units, the intermediate servo bore becomes scored from repeated cycling. The spring side of the piston has line pressure present in R, N, D. Excess leakage at the servo piston results in low line pressure and delayed engagements. During forward speeds, oil loss affects shift quality and reduces clutch life. To salvage cases, install Sonnax intermediate servo sleeve kit 35709-01K.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eContains an aluminum sleeve and a replacement piston with a PTFE seal\u003c\/li\u003e\n\u003cli\u003eDrop-in solution requires no machining of the transmission case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eSleeve\u003c\/li\u003e\n\u003cli\u003eServo Piston\u003c\/li\u003e\n\u003cli\u003eSeal \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"col-4\"\u003e\n\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNo engine braking in manual 2nd\u003c\/li\u003e\n\u003cli\u003eLow line pressure in Reverse\u003c\/li\u003e\n\u003cli\u003eLow line pressure in Neutral\u003c\/li\u003e\n\u003cli\u003eLow line pressure in Drive\u003c\/li\u003e\n\u003cli\u003eDelayed engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"col-4\"\u003e\n\u003cp\u003e\u003cstrong\u003eCause:\u003c\/strong\u003e\u003c\/p\u003e\nCase bore wear and oil loss at the intermediate servo.\u003c\/div\u003e\n\u003cdiv class=\"col-4\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"col-4 last\"\u003e\n\u003cp\u003e\u003cstrong\u003eCorrection:\u003c\/strong\u003e\u003c\/p\u003e\nSonnax intermediate servo sleeve kit salvages the case, and eliminates the complaints caused by oil loss.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184399.pdf?v=1793635380\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129574367451,"sku":"35709-01K","price":66.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656710.jpg?v=1786547290"},{"product_id":"band-adjustment-screw-jam-nut","title":"Band Adjustment Screw Jam Nut","description":"\n\u003cp\u003eThe Sonnax 28127 Band Adjustment Screw Jam Nut is a vital yet often overlooked component in GM Powerglide transmissions, engineered to provide secure and reliable band adjustment. Specifically designed for the OE-style band adjustment screw, this hardened steel jam nut maintains precise adjustment and eliminates the risk of screw rotation or loosening under load.\u003c\/p\u003e\n\n\u003cp\u003eCrafted to Sonnax’s rigorous quality standards, the 28127 nut delivers an exact fit and dependable performance, making it ideal for both routine rebuilds and high-performance applications. Whether used alone or as part of Sonnax’s heavy-duty band adjustment screw kit, this jam nut ensures consistent band pressure, improves transmission durability, and contributes to clean, positive gear shifts throughout Powerglide assemblies.\u003c\/p\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129578922203,"sku":"28127","price":10.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656989.jpg?v=1786547479"},{"product_id":"band-anchor-strut","title":"Band Anchor Strut","description":"\n\u003cp\u003eThe Sonnax 28108 Band Anchor Strut is a heavy-duty replacement component engineered to strengthen the band anchor assembly in GM Powerglide transmissions. Crafted with an extra-thick cross‑section, this precision-molded strut resists bending under the high binding forces exerted during gear shifts, providing more reliable anchoring compared to standard OE parts.\u003c\/p\u003e\n\n\u003cp\u003eDesigned to guide and stabilize the servo band, the 28108 ensures proper alignment and tension, which translates into cleaner engagement and reduced risk of servo or band droop over repeated use. Manufactured to Sonnax’s exacting standards, this strut delivers long-lasting durability, making it an ideal upgrade for street-driven rebuilds or race‑tuned Powerglide builds. By reinforcing a critical yet often overstressed internal element, the 28108 helps preserve transmission integrity and enhances shift performance under all driving conditions.\u003c\/p\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129578954971,"sku":"28108","price":126.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656991.jpg?v=1786547481"},{"product_id":"extra-wide-band","title":"Extra Wide Band","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax offers extra wide band S019961 from Alto with red friction material for the GM Powerglide transmission. The band features an all-new construction, not a relined core.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"specs-panel\"\u003eSpecs:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: Red friction lining\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579020507,"sku":"S019961","price":719.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656993.jpg?v=1786547482"},{"product_id":"heavy-duty-band-adjustment-screw-kit","title":"Heavy Duty Band Adjustment Screw Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eOE GM Powerglide band adjustment screws can deflect or bend, causing band slippage or even transmission case breakage. Sonnax band adjustment screw kit 28612-01K features an improved screw made from high-strength, hardened alloy steel that won't bend or break at high pressure.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eFor use with OE or aftermarket cases\u003c\/li\u003e\n\u003cli\u003eStock-thread-length screw\u003c\/li\u003e\n\u003cli\u003eZinc-plated to prevent corrosion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eScrew\u003c\/li\u003e\n\u003cli\u003eNut\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579053275,"sku":"28612-01K","price":93.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656995.jpg?v=1786547483"},{"product_id":"race-calibrated-servo-return-spring-kit","title":"Race-Calibrated Servo Return Spring Kit","description":"\n\u003cp class=\"sans\"\u003eOE Part No. \u003cstrong\u003e3830235, 3815914, 3830235\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eMystery band failures in GM Powerglides are a common result of using inconsistent aftermarket servo return springs and weak OE springs prone to collapse. This is a problem that can be traced directly to the \u003ca href=\"http:\/\/www.sonnax.com\/tech_resources\/83-understanding-overcoming-the-powerglide-servo-pin-bias-effect-part-1\"\u003epin bias effect\u003c\/a\u003e. Sonnax race-calibrated servo return spring kit 28133-HD counteracts pin bias effect to ensure consistent servo function for longer band life and a cooler transmission. The spring's higher seat pressure helps ensure full servo release, but also features a lower spring rate to prevent excessive release force in the apply position.\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"bx-pager\"\u003e\u003ca href=\"https:\/\/www.sonnax.com\/parts\/4319-race-calibrated-servo-return-spring-kit\" data-slide-index=\"1\"\u003eWatch this video\u003c\/a\u003e\u003c\/span\u003e to see exactly how an OE servo performs at high pressures when fitted with an OE, light aftermarket or Sonnax race-calibrated spring.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eSpecifically designed to work with line pressures from 200–275 psi\u003c\/li\u003e\n\u003cli\u003eIncludes two .050\" shims to aid in tuning at higher line pressures\u003c\/li\u003e\n\u003cli\u003eWorks with both OE and aftermarket servo pistons\u003c\/li\u003e\n\u003cli\u003eAlso available in Sonnax supported servo master kit \u003ca href=\"..\/i-30503440-supported-servo-master-kit.html\"\u003e28821-20K\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eShims (2)\u003c\/li\u003e\n\u003cli\u003eSpring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184473.pdf?v=1793635444\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579086043,"sku":"28133-HD","price":40.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656997.jpg?v=1786547485"},{"product_id":"replacement-seal-kit-for-28821-10k","title":"Replacement Seal Kit For 28821-10K","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eReplacement seal kit for Sonnax Smart-Tech\u003csup\u003e®\u003c\/sup\u003e ratio-style servo kit \u003ca href=\"..\/i-30503438-smart-tech-ratio-style-servo-kit.html\"\u003e28821-10K\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cdiv id=\"components\"\u003e \u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003eCase-to-Housing O-Ring\u003c\/li\u003e\n\u003cli\u003eHousing-to-Piston O-Ring\u003c\/li\u003e\n\u003cli\u003eHousing-to-Separator O-Ring\u003c\/li\u003e\n\u003cli\u003eSecondary Release D-Ring\u003c\/li\u003e\n\u003cli\u003eSeparator-to-Primary O-Ring\u003c\/li\u003e\n\u003cli\u003ePrimary Piston Seals (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eServo Pin Seal \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579118811,"sku":"28821-10SK","price":45.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198656999.jpg?v=1786547486"},{"product_id":"replacement-seal-kit-for-ptfe-sealing-ring-style-servo-kits","title":"Replacement Seal Kit For PTFE Sealing Ring-Style Servo Kits","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax replacement seal kit 28821-TK refreshes the seals in Sonnax PTFE sealing ring-style servo kits.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eServo Piston Seals (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eServo Cover Gasket\u003c\/li\u003e\n\u003cli\u003eServo Cover O-Ring\u003c\/li\u003e\n\u003cli\u003eServo Pin O-Rings (2) \u003cem\u003e1 Extra\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579151579,"sku":"28821-TK","price":38.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657001.jpg?v=1786547488"},{"product_id":"replacement-seal-kit-for-28821-09k","title":"Replacement Seal Kit For 28821-09K","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eReplacement seal kit for super hold servo kit \u003ca href=\"..\/i-30503439-super-hold-servo-kit.html\"\u003e28821-09K\u003c\/a\u003e\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003ePTFE Primary Piston Seal (2)\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003ePTFE Servo Pin Seal (2) \u003cem\u003e1 Extra\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eSecondary Piston D-Ring\u003c\/li\u003e\n\u003cli\u003eCase to Cover O-Ring\u003c\/li\u003e\n\u003cli\u003eCover to Separator O-Ring\u003c\/li\u003e\n\u003cli\u003ePin to Secondary Piston O-Ring\u003c\/li\u003e\n\u003cli\u003eSeparator to Primary Piston O-Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579184347,"sku":"28821-09SK","price":49.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657003.jpg?v=1786547489"},{"product_id":"replacement-seal-kit-for-o-ring-style-servo-kits","title":"Replacement Seal Kit For O-Ring Style Servo Kits","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax replacement seal kit 28821-OK refreshes the seals in Sonnax O-ring style servo kits.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eServo Piston O-Rings (2)\u003c\/li\u003e\n\u003cli\u003eServo Cover Gasket\u003c\/li\u003e\n\u003cli\u003eServo Cover O-Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579217115,"sku":"28821-OK","price":19.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657005.jpg?v=1786547490"},{"product_id":"reverse-clutch-piston-seal-kit","title":"Reverse Clutch Piston Seal Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax reverse clutch piston seal kit 28761-01SK replaces inner and outer Reverse clutch piston seals in GM Powerglides and can be used with OE or aftermarket pistons.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eInner Seal\u003c\/li\u003e\n\u003cli\u003eOuter Seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579249883,"sku":"28761-01SK","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657007.jpg?v=1786547491"},{"product_id":"servo-cover-kit-purple-anodized","title":"Servo Cover Kit - Purple Anodized","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003ePurple anodized\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglides used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo cover kit 28821-03K works with Sonnax piston kits \u003ca href=\"..\/i-30503435-servo-piston-kit-o-ring-style.html\"\u003e28821-01K\u003c\/a\u003e or \u003ca href=\"..\/i-30503434-servo-piston-kit-ptfe-sealing-ring-style.html\"\u003e28821-02K\u003c\/a\u003e to improve transmission performance and durability under high-pressure conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eLightweight, billet aluminum cover replaces heavy, cast-iron OE cover\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003eCover \u003cem\u003ePurple Anodized\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe Plug\u003c\/li\u003e\n\u003cli\u003eHex Head Bolts (3)\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579282651,"sku":"28821-03K","price":154.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657009.jpg?v=1786547492"},{"product_id":"servo-cover-kit-non-anodized","title":"Servo Cover Kit - Non-Anodized","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eNon-anodized\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglides used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo cover kit 28821-06K works with Sonnax piston kits \u003ca href=\"..\/i-30503435-servo-piston-kit-o-ring-style.html\"\u003e28821-01K\u003c\/a\u003e or \u003ca href=\"..\/i-30503434-servo-piston-kit-ptfe-sealing-ring-style.html\"\u003e28821-02K\u003c\/a\u003e to improve transmission performance and durability under high-pressure conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eLightweight, billet aluminum cover replaces heavy, cast-iron OE cover\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eCover \u003cem\u003eNon-Anodized\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe Plug\u003c\/li\u003e\n\u003cli\u003eHex Head Bolts (3)\u003c\/li\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579610331,"sku":"28821-06K","price":160.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657011.jpg?v=1786547494"},{"product_id":"servo-pin-clip","title":"Servo Pin Clip","description":"\n\u003cp\u003eThe Sonnax 28132 Servo Pin Clip is a precision-engineered retaining clip crafted specifically for GM Powerglide transmissions. Designed to securely hold the servo piston rod in place, this clip ensures that the servo assembly functions reliably under high hydraulic pressure and dynamic load conditions.\u003c\/p\u003e\n\n\u003cp\u003eManufactured to Sonnax’s stringent quality standards, the 28132 features durable steel construction that resists wear and deformation, providing consistent retention where original equipment parts have become obsolete. Whether performing a standard rebuild or constructing a high-performance Powerglide transmission, this essential clip ensures accurate servo operation, helps prevent internal component misalignment, and maintains shift quality and durability over time. Available individually, the 28132 clip is a straightforward, OEM-quality replacement that brings reliability back to your valve body’s servo mechanism.\u003c\/p\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579643099,"sku":"28132","price":15.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657013.jpg?v=1786547495"},{"product_id":"servo-piston-use-with-ptfe-or-metal-seals","title":"Servo Piston - Use With PTFE Or Metal Seals","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eDual-seal design, Use with PTFE or metal seals\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp class=\"sans\"\u003eOE Part No. \u003cstrong\u003e3846173\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eSonnax servo piston 28821-02 for GM Powerglide units features a dual-seal design and can be used with one or two PTFE or OEM-style cast seals.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-strength billet aluminum piston\u003c\/li\u003e\n\u003cli\u003ePiston features a rounded profile for better stress distribution\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579675867,"sku":"28821-02","price":71.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657015.jpg?v=1786547496"},{"product_id":"servo-piston-and-cover-kit-purple-anodized","title":"Servo Piston \u0026 Cover Kit - Purple Anodized","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eDual-seal design, PTFE sealing ring style, Purple anodized\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglide transmissions used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo piston and cover kit 28821-05K improves transmission performance and durability under high-pressure conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-strength billet aluminum piston also features a rounded profile for better stress distribution\u003c\/li\u003e\n\u003cli\u003eDual PTFE seals improve sealing, are low-friction and interchangeable with the OE cast aluminum seal ring\u003c\/li\u003e\n\u003cli\u003eLightweight, billet aluminum cover replaces heavy, cast-iron OE cover\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eCover \u003cem\u003ePurple Anodized\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe Plug\u003c\/li\u003e\n\u003cli\u003eHex Head Bolts (3)\u003c\/li\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003ePiston\u003c\/li\u003e\n\u003cli\u003ePiston Seal Rings (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184475.pdf?v=1793635443\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579708635,"sku":"28821-05K","price":207.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657017.jpg?v=1786547498"},{"product_id":"servo-piston-and-cover-kit-non-anodized","title":"Servo Piston \u0026 Cover Kit - Non-Anodized","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eDual-seal design, PTFE sealing ring style, Non-anodized\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglide transmissions used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo piston and cover kit 28821-08K improves transmission performance and durability under high-pressure conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-strength billet aluminum piston also features a rounded profile for better stress distribution\u003c\/li\u003e\n\u003cli\u003eDual PTFE seals improve sealing, are low-friction and interchangeable with the OE cast aluminum seal ring\u003c\/li\u003e\n\u003cli\u003eLightweight, billet aluminum cover replaces heavy, cast-iron OE cover\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eCover \u003cem\u003eNon-Anodized\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePipe Plug\u003c\/li\u003e\n\u003cli\u003eHex Head Bolts (3)\u003c\/li\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003ePiston\u003c\/li\u003e\n\u003cli\u003ePiston Seals (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184477.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579741403,"sku":"28821-08K","price":209.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657019.jpg?v=1786547499"},{"product_id":"servo-piston-kit-ptfe-sealing-ring-style","title":"Servo Piston Kit - PTFE Sealing Ring Style","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eDual-seal design, PTFE sealing ring style\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglide transmissions used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo piston kit 28821-02K improves transmission performance and durability under high-pressure conditions. The piston can be assembled using only one seal ring for lower friction, two aluminum seal rings or any combination in between.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-strength billet aluminum piston also features a rounded profile for better stress distribution\u003c\/li\u003e\n\u003cli\u003eDual PTFE seals improve sealing, are low-friction and interchangeable with the OE cast aluminum seal ring\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003ePiston\u003c\/li\u003e\n\u003cli\u003eSeal Rings (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184479.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579774171,"sku":"28821-02K","price":181.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657021.jpg?v=1786547501"},{"product_id":"servo-piston-kit-o-ring-style","title":"Servo Piston Kit - O-ring Style","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eDual-seal design, O-ring style\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eGM Powerglides used for drag racing generate higher line pressure than the OE servo piston can withstand. At pressures over 200 psi, the OE piston can crack, resulting in transmission failure. Sonnax servo piston kit 28821-01K improves transmisison performance and durability under high-pressure conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eHigh-strength billet aluminum piston also features a rounded profile for better stress distribution\u003c\/li\u003e\n\u003cli\u003eDual O-ring-style piston improves sealing in worn or scuffed cases\u003c\/li\u003e\n\u003cli\u003eEasy to install, no case modifications required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003ePiston\u003c\/li\u003e\n\u003cli\u003eO-Rings (2)\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184480.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579839707,"sku":"28821-01K","price":195.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657023.jpg?v=1786547502"},{"product_id":"servo-piston-return-spring","title":"Servo Piston Return Spring","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eThe servo return spring is the source of many \"mystery\" band failures caused by inconsistent servo release and weak springs prone to collapse. Sonnax servo piston return spring 28133 for GM Powerglide units is a lighter-than-stock spring ideal for low line pressure applications of 175 psi or less.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"notes-panel\"\u003eNote:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cp\u003eIf this spring is installed in applications with more than 175 psi, the servo may not fully release due to the \u003ca href=\"https:\/\/www.sonnax.com\/tech_resources\/83\"\u003epin bias effect\u003c\/a\u003e, resulting in dragging and burning of the band. Sonnax \u003ca href=\"..\/i-30503422-race-calibrated-servo-return-spring-kit.html\"\u003e28133-HD\u003c\/a\u003e is recommended for higher pressure applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579872475,"sku":"28133","price":64.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657025.jpg?v=1786547505"},{"product_id":"servo-piston-seal","title":"Servo Piston Seal","description":"\n\u003cp class=\"sans\"\u003eOE Part No. \u003cstrong\u003e3789084\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax PTFE servo piston seal fits OE and aftermarket GM Powerglide servos.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"specs-panel\"\u003eSpecs:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: PTFE\u003c\/li\u003e\n\u003cli\u003eSeal Style: Scarf cut\u003c\/li\u003e\n\u003cli\u003eHeight: 0.143\"\u003c\/li\u003e\n\u003cli\u003eOuter Dia.: 2.766\"\u003c\/li\u003e\n\u003cli\u003eWidth: 0.088\"\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579905243,"sku":"18608T","price":11.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657027.jpg?v=1786547506"},{"product_id":"smart-tech-ratio-style-servo-kit","title":"Smart-Tech® Ratio-Style Servo Kit","description":"\n\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eThe OE Powerglide servo design is inherently flawed. Its spring-powered design suffers from an improper apply\/release ratio that is responsible for otherwise unexplained band failures, input shaft failures and staging issues. Now known as the pin bias effect, the resulting burnt bands, broken parts and inconsistent operation have plagued the Powerglide for years, leading many to give up on this transmission and seek other options.\u003c\/p\u003e\n\n\u003cp\u003eSonnax Smart-Tech\u003csup\u003e®\u003c\/sup\u003e ratio-style servo kit 28821-10K is a revolutionary part that conquers the pin bias effect once and for all, making this the ultimate choice for running Powerglides in ever more extreme applications. The unique design has the same apply area as the OE Powerglide servo, but increased release area so the servo is hydraulically released like other modern servos such as the C-4, C-6 and 4L60.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eAll-in-one kit makes it easy to install a state-of-the-art servo system\u003c\/li\u003e\n\u003cli\u003eSupported servo design eliminates piston binding\u003c\/li\u003e\n\u003cli\u003eSignificantly lighter spring prevents staging issues and backing up when trans brake is applied\u003c\/li\u003e\n\u003cli\u003ePrevents input shaft failure due to tie-up on shift\u003c\/li\u003e\n\u003cli\u003eAllows greater tuning of high clutch apply to prevent tire spin and pedaling after the shift\u003c\/li\u003e\n\u003cli\u003eDelivers more total net apply force than any stock-sized servo\u003c\/li\u003e\n\u003cli\u003eEliminates need to calibrate servo return spring to line pressure or varying case depth\u003c\/li\u003e\n\u003cli\u003eImproved sealing throughout reduces fluid loss and is optimized for low friction movement\u003c\/li\u003e\n\u003cli\u003eLow-profile design ensures adequate clearance\u003c\/li\u003e\n\u003cli\u003e6061 Anodized billet aluminum cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eServo Assembly\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003eCase-to-Cover O-Ring\u003c\/li\u003e\n\u003cli\u003eServo Pin Seals (2) \u003cem\u003ePTFE, 1 Extra\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Piston Seals (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eReturn Spring\u003c\/li\u003e\n\u003cli\u003eCover Bolts (3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184482.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129579970779,"sku":"28821-10K","price":935.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657029.jpg?v=1786547507"},{"product_id":"super-hold-servo-kit","title":"Super Hold Servo Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eSonnax super hold servo kit 28821-09K is an all-in-one upgrade ideal for a competitive edge in GM Powerglide applications where racers are looking to reduce line pressure to free up horsepower. The kit's dual piston design features 30% more apply area to increase band apply force at your current line pressure or allow you to reduce line pressure by 20% to 30% while maintaining the same apply force.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eDual piston design for 30% more apply area\u003c\/li\u003e\n\u003cli\u003eSpring counteracts \u003ca href=\"http:\/\/www.sonnax.com\/tech_resources\/83-understanding-overcoming-the-powerglide-servo-pin-bias-effect-part-1\"\u003epin bias effect\u003c\/a\u003e up to 275 psi\u003c\/li\u003e\n\u003cli\u003eImproved sealing throughout\u003c\/li\u003e\n\u003cli\u003eLow-profile design ensure adequate clearance\u003c\/li\u003e\n\u003cli\u003e6061 Anodized billet aluminum cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"notes-panel\"\u003eNote:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA common question is, \"I have an extreme application, how do I choose between the Sonnax Smart-Tech\u003csup\u003e®\u003c\/sup\u003e servo and the super hold servo?\"\u003c\/strong\u003e\u003c\/em\u003e\u003cbr\u003eBoth are track-proven in today’s high-power vehicles. With its ratio-style release and supported pin design, the Smart-Tech \u003ca href=\"..\/i-30503438-smart-tech-ratio-style-servo-kit.html\"\u003e28821-10K\u003c\/a\u003e is the best all-around upgrade that eliminates EVERY problem associated with the OE servo. Racers looking to reduce line pressure for greater efficiency will most benefit from the super hold servo’s 30% more apply area.\u003c\/p\u003e\n\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eServo Assembly\u003c\/li\u003e\n\u003cli\u003eCover Gasket\u003c\/li\u003e\n\u003cli\u003eCase-to-Cover O-Ring\u003c\/li\u003e\n\u003cli\u003eReturn Spring\u003c\/li\u003e\n\u003cli\u003eServo Pin Seals (2) \u003cem\u003ePTFE, 1 Extra\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Piston Seals (2) \u003cem\u003ePTFE\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184483.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129580003547,"sku":"28821-09K","price":776.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657031.jpg?v=1786547508"},{"product_id":"supported-servo-master-kit","title":"Supported Servo Master Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eConventional GM Powerglide servos are not well-supported and the return springs do not function properly, both leading causes of band failure. Sonnax supported servo master kit 28821-20K is an all-in-one kit that eliminates piston binding and includes a race-calibrated spring to counteract the \u003ca href=\"http:\/\/www.sonnax.com\/tech_resources\/83-understanding-overcoming-the-powerglide-servo-pin-bias-effect-part-1\"\u003epin bias effect\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eAt high apply pressures or with a worn servo pin bore, the servo piston is side-loaded in the case, causing friction and binding of the piston. The supported pin design of this Sonnax kit eliminates friction caused by side-loading and ensures the servo piston will apply and release without binding.\u003c\/p\u003e\n\n\u003cp\u003e\"Mystery\" band failures are a common result of aftermarket servo return springs and weak OE springs prone to collapse that do not reliably release the servo. The Sonnax spring in this kit is race-calibrated to ensure consistent servo function for longer band life and a cooler transmission. The spring's higher seat pressure helps ensure full servo release, but also features a lower spring rate to prevent excessive release force in the apply position.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eUnique cover and pin combination eliminates piston binding that causes unexplained band failure\u003c\/li\u003e\n\u003cli\u003eRace-calibrated spring counteracts pin bias effect up to 275 psi\u003c\/li\u003e\n\u003cli\u003eDual PTFE seal rings for better seal and low friction\u003c\/li\u003e\n\u003cli\u003eOE apply area\u003c\/li\u003e\n\u003cli\u003eLow-profile design ensures adequate clearance\u003c\/li\u003e\n\u003cli\u003e6061 Anodized billet aluminum cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eSupported Servo Cover\u003c\/li\u003e\n\u003cli\u003eSupported Servo Pin\u003c\/li\u003e\n\u003cli\u003eServo Piston\u003c\/li\u003e\n\u003cli\u003eReturn Spring\u003c\/li\u003e\n\u003cli\u003eRetaining Clip\u003c\/li\u003e\n\u003cli\u003eGasket\u003c\/li\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003ePin O-Rings (2) \u003cem\u003e1 extra\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eDrain Plug \u003cem\u003eNot shown\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eBolts (3) \u003cem\u003eNot shown\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003ePin Shims (3)\u003c\/li\u003e\n\u003cli\u003eSpring Shims (2)\u003c\/li\u003e\n\u003cli\u003ePTFE Piston Seal Rings (2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184485.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129580036315,"sku":"28821-20K","price":404.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657033.jpg?v=1786547510"},{"product_id":"supported-servo-pin-and-cover-kit","title":"Supported Servo Pin \u0026 Cover Kit","description":"\n\u003cdiv class=\"spaced-vertical\"\u003e\n\u003cp\u003eConventional GM Powerglide servos are not well-supported. At high apply pressures or with a worn servo pin bore, the servo piston is side-loaded in the case, causing friction and binding of the piston. The unique Sonnax supported servo pin and cover kit 28821-19K eliminates friction caused by side-loading and ensures the servo piston will apply and release without binding.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eUnique design eliminates piston binding that causes unexplained band failure\u003c\/li\u003e\n\u003cli\u003eLow-drag O-ring prevents high gear \u0026amp; release oil pressure bore leaks\u003c\/li\u003e\n\u003cli\u003eCompatible with all OE and aftermarket Powerglide servo pistons\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"part-accordion cb spaced-vertical\"\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel for=\"components-panel\"\u003eContents:\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"accordion-content\"\u003e\n\u003cul\u003e\n\u003cli\u003eSupported Servo Pin\u003c\/li\u003e\n\u003cli\u003eSupported Servo Cover\u003c\/li\u003e\n\u003cli\u003eShims (3)\u003c\/li\u003e\n\u003cli\u003eRetaining Clip\u003c\/li\u003e\n\u003cli\u003eGasket\u003c\/li\u003e\n\u003cli\u003ePin O-Ring\u003c\/li\u003e\n\u003cli\u003eCover O-Ring\u003c\/li\u003e\n\u003cli\u003ePlug \u003cem\u003eNot shown\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eBolts (3) \u003cem\u003eNot shown\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \u003c!-- suncoast-documents:start --\u003e\u003cdiv class=\"suncoast-product-documents\"\u003e\n\u003ch3 class=\"h6\"\u003eDocuments\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/184487.pdf?v=1793635459\" target=\"_blank\" rel=\"noopener\"\u003eInstructions\u003c\/a\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003c\/div\u003e\u003c!-- suncoast-documents:end --\u003e","brand":"Sonnax","offers":[{"title":"Default Title","offer_id":49129580069083,"sku":"28821-19K","price":308.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657037.jpg?v=1786547511"},{"product_id":"low-servo-cover-gasket","title":"Low Servo Cover Gasket","description":"\n\u003cp\u003e\u003cstrong\u003eLOW SERVO COVER GASKET\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eThe Coan Racing COA‑12158 Low Servo Cover Gasket is a precision-cut sealing solution designed exclusively for the lower servo cover in GM Powerglide transmissions. Crafted from durable gasket material and engineered to factory dimensions, it ensures an effective, leak-free seal at the interface of the servo cover. \u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eIts exact fit maintains hydraulic integrity and prevents fluid seepage under high-pressure conditions, preserving consistent servo function and optimal shift performance. Whether you're servicing a standard Powerglide or building a performance unit, this gasket provides a reliable and OEM-quality sealing solution to restore and maintain internal pressure control.\u003c\/span\u003e\u003c\/p\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129582297307,"sku":"COA-12158","price":5.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657492.jpg?v=1786547592"},{"product_id":"low-servo-cover-o-ring","title":"Low Servo Cover O-Ring","description":"\n\u003cp\u003e\u003cstrong\u003eLOW SERVO COVER O-RING\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eThe Coan Racing COA‑12159 Low Servo Cover o-ring is a precision sealing solution designed exclusively for the lower servo cover in GM Powerglide transmissions. Crafted from durable material and engineered to factory dimensions, it ensures an effective, leak-free seal of the servo cover. \u003c\/span\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eIts exact fit maintains hydraulic integrity and prevents fluid seepage under high-pressure conditions, preserving consistent servo function and optimal shift performance. Whether you're servicing a standard Powerglide or building a performance unit, this o-ring provides a reliable and OEM-quality sealing solution to restore and maintain internal pressure control.\u003c\/span\u003e\u003c\/p\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129582330075,"sku":"COA-12159","price":6.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657494.jpg?v=1786547593"},{"product_id":"low-servo-ring","title":"Low Servo Ring","description":"\n\u003cp\u003e\u003cstrong\u003eLOW SERVO RING\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Coan Racing COA‑12311 Low Servo Ring is a precision-engineered sealing component designed specifically for GM Powerglide transmissions. Machined to exact factory dimensions using durable materials, this ring ensures a leak-free seal, maintaining proper hydraulic pressure during gear shifts. Its accurate fit resists extrusion and wear, even under repeated cycling and thermal stress.\u003c\/p\u003e\n\n\u003cp\u003eIdeal for both performance builds and routine rebuilds, the COA‑12311 restores original hydraulic integrity and enhances shift reliability, helping to preserve clean, consistent transmission performance.\u003c\/p\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129584492763,"sku":"COA-12311","price":7.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657595.jpg?v=1786547654"},{"product_id":"billet-servo-o-ring-set-pair","title":"Billet Servo O-Ring Set - Pair","description":"\n\u003cp\u003e\u003cstrong\u003eBILLET SERVO O-RING SET (PAIR)\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe Coan Racing COA‑12311A Billet Servo O‑Ring Set (Pair) is a precision sealing solution crafted specifically for GM Powerglide transmissions. These billet-style O‑rings are engineered to fit the low‑servo piston, forming a reliable barrier that maintains hydraulic pressure without extrusion under intense load conditions.\u003c\/p\u003e\n\n\u003cp\u003eTheir robust design and high-grade composition ensure long-lasting performance, even under thermal cycling and high-frequency shifting scenarios common in racing or spirited street use. Ideal for both routine rebuilds and high-demand Powerglide builds, the COA‑12311A set restores critical servo sealing, safeguarding clean and consistent shift quality.\u003c\/p\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129584525531,"sku":"COA-12311A","price":3.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657597.jpg?v=1786547656"},{"product_id":"heavy-duty-band-adjusting-screw-w-nut","title":"Heavy Duty Band Adjusting Screw w\/ Nut","description":"\n\u003cdiv class=\"page-title-wrapper product\"\u003e\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003eH.D.BAND ADJUSTING SCREW W\/NUT\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe Coan Racing COA‑12840 Heavy‑Duty Band Adjusting Screw with Nut is a reinforced adjustment assembly specifically designed for GM Powerglide transmissions. The screw and accompanying nut provide precise, tamper-resistant band tension adjustments that maintain consistent pressure even under extreme operating conditions.\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eFeaturing a robust design tailored to withstand heavy load cycles and vibration, the COA‑12840 ensures reliable band alignment and helps prevent slippage or maladjustment over time. It installs directly into standard Powerglide assemblies, offering a superior, long-lasting solution for both performance rebuilds and heavy-duty transmission builds.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129589276891,"sku":"COA-12840","price":63.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657839.jpg?v=1786547756"},{"product_id":"billet-servo-piston-w-dual-cast-metal-rings","title":"Billet Servo Piston w\/ Dual Cast Metal Rings","description":"\n\u003cdiv class=\"page-title-wrapper product\"\u003e\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003eBILLET SERVO PISTON (DUAL CAST METAL RINGS, RINGS INCLUDED)\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe Coan Racing COA‑12846A Billet Servo Piston (Dual Cast Metal Rings) is a precision-engineered replacement for GM Powerglide transmissions, crafted to meet the rigorous demands of performance and race applications. This piston is machined from high-grade billet material and fitted with dual cast metal sealing rings, delivering robust hydraulic integrity and enhanced resistance to wear and thermal fatigue. Designed to exact specifications, it installs directly into standard servo bores, ensuring reliable sealing and controlled piston movement during gear shifts.\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eIdeal for both high-stress street\/strip builds and professional race setups, the COA‑12846A restores precise servo actuation and maintains consistent line pressure, ultimately delivering cleaner, firmer shifts and improving transmission durability.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129589473499,"sku":"COA-12846A","price":61.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657851.jpg?v=1786547763"},{"product_id":"billet-aluminum-low-servo-cover-red","title":"Billet Aluminum Low Servo Cover - Red","description":"\n\u003cdiv class=\"page-title-wrapper product\"\u003e\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003eBILLET ALUMINUM LOW SERVO COVER (RED, \"COAN RACING\")\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe Coan Racing COA‑12847 Billet Aluminum Low Servo Cover (Red, “COAN RACING”) is a precision-machined, high-performance upgrade designed for GM Powerglide transmissions. Crafted from lightweight aluminum in Coan’s signature red finish, this cover replaces the standard stamped steel version with a more durable, rigid component. It enhances the sealing surface and resists flex and distortion under high line pressure, maintaining hydraulic integrity during aggressive shifting.\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe COA‑12847 installs directly into Powerglide servo bores and offers both aesthetic appeal and functional strength. Its robust construction makes it an excellent choice for performance builds, racer maintenance, or any application where reliable shift modulation and long-term durability are desired.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129589506267,"sku":"COA-12847","price":70.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657853.jpg?v=1786547764"},{"product_id":"servo-spring","title":"Servo Spring","description":"\n\u003cdiv class=\"page-title-wrapper product\"\u003e\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003eSPRING, PG SERVO\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe Coan Racing COA‑12851 Powerglide Servo Spring is a specialized spring designed for use within the servo assembly of GM Powerglide transmissions. Crafted to meet exact specifications, this spring provides precise servo piston actuation, ensuring consistent band release and engagement during gear shifts. Engineered for durability, it maintains its tension characteristics under high-temperature and high-cycle conditions typical of racing and heavy-use applications.\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThe COA‑12851 is a direct-fit replacement that contributes to reliable shift quality and long-term hydraulic performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129589604571,"sku":"COA-12851","price":14.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198657865.jpg?v=1786547768"},{"product_id":"intermediate-kickdown-band-coa-32290","title":"Intermediate Kickdown Band","description":"\n\u003cdiv id=\"product.info.description\" class=\"data item content\" role=\"tabpanel\" data-role=\"content\" aria-labelledby=\"tab-label-product.info.description\" aria-hidden=\"false\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cp\u003e\u003cstrong\u003eINTERMEDIATE KICKDOWN BAND\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cp data-start=\"0\" data-end=\"37\"\u003eThe Coan Racing COA‑32290 Intermediate Kickdown Band is a high-performance replacement band engineered to fit TH350 transmissions. Designed to engage the intermediate clutch circuit with precision, this kickdown band ensures smooth, reliable downshifts and power delivery under load conditions. \u003cspan class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\"\u003eManufactured to Coan Racing’s strict performance standards, the COA‑32290 offers durable, consistent operation in both street and racing environments\u003c\/span\u003e. Its construction delivers long service life and dependable hydraulic actuation, making it an essential component for anyone rebuilding or upgrading their transmission to handle high-demand usage.\u003c\/p\u003e","brand":"Coan","offers":[{"title":"Default Title","offer_id":49129610379483,"sku":"COA-32290","price":17.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659406.jpg?v=1786548358"},{"product_id":"low-band-premium-competition-friction-lining","title":"Low Band - Premium Competition Friction Lining","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003ePOWERGLIDE - LOW BAND, PREMIUM COMPETITION FRICTION LINING\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eWith the finest lining and adhesives available to insure performance and reliability, these bands play an important role in transmission operation. Kevlar lining available for extreme duty applications.\u003c\/p\u003e\n\u003cp class=\"page-title\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePOWERGLIDE SUPER BAND\u003c\/strong\u003e ATI's Super Band is a performance replacement band for the Powerglide low gear band which plays a critical role in high performance transmission operation. The band is a completely new core made of investment casted steel with no used components. It offers \u003cstrong\u003e21% more clamping\u003c\/strong\u003e area over a stock band for more effective holding. The band's superior lining is made of heavy-duty Premium Competition Friction Lining to ensure high performance and longevity. It is recommended for use with all popular dual ring servos.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129616802011,"sku":"205290","price":201.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659879.jpg?v=1786548565"},{"product_id":"low-band-red-lining","title":"Low Band - Red Lining","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003ePOWERGLIDE - LOW BAND WITH RED LINING\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eWith the finest lining and adhesives available to insure performance and reliability, these bands play an important role in transmission operation. Kevlar lining available for extreme duty applications.\u003c\/p\u003e\n\u003cp class=\"page-title\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePOWERGLIDE SUPER BAND\u003c\/strong\u003e ATI's Super Band is a performance replacement band for the Powerglide low gear band which plays a critical role in high performance transmission operation. The band is a completely new core made of investment casted steel with no used components. It offers \u003cstrong\u003e21% more clamping\u003c\/strong\u003e area over a stock band for more effective holding. The band's superior lining is made of heavy-duty Premium Competition Friction Lining to ensure high performance and longevity. It is recommended for use with all popular dual ring servos.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129616834779,"sku":"205310","price":201.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659880.jpg?v=1786548566"},{"product_id":"super-band-3-8-inch-wider-than-oem-carbon-lined","title":"Super Band - 3\/8\" Wider Than OEM - Carbon Lined","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003ePOWERGLIDE - SUPER BAND - 3\/8\" WIDER THAN OEM - CARBON LINED\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eWith the finest lining and adhesives available to insure performance and reliability, these bands play an important role in transmission operation. Kevlar lining available for extreme duty applications.\u003c\/p\u003e\n\u003cp class=\"page-title\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePOWERGLIDE SUPER BAND\u003c\/strong\u003e ATI's Super Band is a performance replacement band for the Powerglide low gear band which plays a critical role in high performance transmission operation. The band is a completely new core made of investment casted steel with no used components. It offers \u003cstrong\u003e21% more clamping\u003c\/strong\u003e area over a stock band for more effective holding. The band's superior lining is made of heavy-duty Premium Competition Friction Lining to ensure high performance and longevity. It is recommended for use with all popular dual ring servos.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129616867547,"sku":"205291","price":485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659881.jpg?v=1786548568"},{"product_id":"super-band-3-8-inch-wider-than-oem-red-lined","title":"Super Band - 3\/8\" Wider Than OEM - Red Lined","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003ePOWERGLIDE - SUPER BAND - 3\/8\" WIDER THAN OEM - RED LINED\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eWith the finest lining and adhesives available to insure performance and reliability, these bands play an important role in transmission operation. Kevlar lining available for extreme duty applications.\u003c\/p\u003e\n\u003cp class=\"page-title\"\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePOWERGLIDE SUPER BAND\u003c\/strong\u003e ATI's Super Band is a performance replacement band for the Powerglide low gear band which plays a critical role in high performance transmission operation. The band is a completely new core made of investment casted steel with no used components. It offers \u003cstrong\u003e21% more clamping\u003c\/strong\u003e area over a stock band for more effective holding. The band's superior lining is made of heavy-duty Premium Competition Friction Lining to ensure high performance and longevity. It is recommended for use with all popular dual ring servos.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129616900315,"sku":"205292","price":485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659882.jpg?v=1786548569"},{"product_id":"band-adjuster-wedge","title":"Band Adjuster Wedge","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003eBAND ADJUSTER WEDGE\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003eThis precision-engineered adjuster wedge is designed to enhance transmission band adjustment accuracy for Powerglide transmissions. Manufactured by ATI Racing, it provides a reliable method to fine-tune band clearance, ensuring consistent engagement and reduced slippage during high-stress shifts. Crafted from durable materials and designed to work seamlessly with ATI’s range of high-performance bands and heavy-duty strut assemblies, the 205337 adjuster wedge is an essential tool for builders demanding precise band setup and long-term reliability.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129616933083,"sku":"205337","price":32.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198659888.jpg?v=1786548570"},{"product_id":"billet-servo-cover-w-teflon-gasket-o-rings-arp-bolts-and-plug","title":"Billet Servo Cover w\/ Teflon Gasket, O-Rings, ARP Bolts \u0026 Plug","description":"\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003ePG - BILLET SERVO COVER WITH TEFLON GASKET, O-RINGS, ARP BOLTS \u0026amp; PLUG\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp class=\"page-title\"\u003e\u003cstrong\u003e\u003cspan class=\"Products1\"\u003eBillet Servo Covers\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003eThese CNC-machined billet aluminum plate covers the servo with style, and precision construction assures an excellent seal. The cover employs permanent lip-type seals to conform to various transmission case bores, feature an anodized finish and ARP bolts.\u003c\/p\u003e","brand":"ATI","offers":[{"title":"Default Title","offer_id":49129624010971,"sku":"205325","price":134.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198660199.jpg?v=1786548817"},{"product_id":"powerglide-high-energy-band","title":"Powerglide High Energy Band","description":"\n\u003cp\u003eThe TCS 625100 is a high-energy friction band designed for the Powerglide transmission. It features upgraded lining material for improved holding power and durability under demanding conditions.\u003c\/p\u003e","brand":"TCS","offers":[{"title":"Default Title","offer_id":49129639149787,"sku":"625100","price":140.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198660759.jpg?v=1786549214"},{"product_id":"powerglide-extra-wide-racing-band","title":"Powerglide Extra Wide Racing Band","description":"\n\u003cp class=\"observing intersected intersecting\"\u003e\u003cstrong\u003ePowerglide Extra Wide Racing Band\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul class=\"observing intersected intersecting\"\u003e\n\u003cli\u003eRed Lining.\u003c\/li\u003e\n\u003cli\u003e2.245″ wide.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TCS","offers":[{"title":"Default Title","offer_id":49129639182555,"sku":"625102","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198660761.jpg?v=1786549216"},{"product_id":"powerglide-dual-sealing-ring-servo-piston","title":"Powerglide Dual Sealing Ring Servo Piston","description":"\n\u003cp class=\"observing intersected intersecting\"\u003e\u003cstrong\u003eTCS Powerglide Dual Sealing Ring Servo Piston\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul class=\"observing intersected intersecting\"\u003e\n\u003cli\u003eZero leakage billet aluminum dual steel sealing ring servo piston.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TCS","offers":[{"title":"Default Title","offer_id":49129639248091,"sku":"723001S","price":51.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198660765.jpg?v=1786549219"},{"product_id":"powerglide-black-anodized-servo-cover","title":"Powerglide Black Anodized Servo Cover","description":"\n\u003cp class=\"observing intersected intersecting\"\u003e\u003cstrong\u003eTCS Powerglide Black Anodized Servo Cover\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul class=\"observing intersected intersecting\"\u003e\n\u003cli\u003eA nice “Dress-Up” item for your Powerglide.\u003c\/li\u003e\n\u003cli\u003eMade from billet aluminum, lighter than the stock servo cover.\u003c\/li\u003e\n\u003cli\u003eKit includes all mounting bolts and gasket.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TCS","offers":[{"title":"Default Title","offer_id":49129639313627,"sku":"728000B","price":43.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198660767.jpg?v=1786549220"}],"url":"https:\/\/suncoastperformance.com\/collections\/gas-servos-components.oembed","provider":"SunCoast Diesel","version":"1.0","type":"link"}