{"product_id":"boost-valve-kit-early-style-490-dia-factory-style","title":"Boost Valve Kit - Early Style, .490\" Dia., Factory Style","description":"\n\u003ch2 class=\"light\"\u003e\u003cstrong\u003eEarly style, .490\" dia., increased ratio, factory style\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eGM 4L60-E and 4L65-E transmissions frequently have poor line rise, which can result in 3-4 clutch, 2-4 band failure or poor shift quality. The duty cycle of the EPC solenoid causes the boost sleeve to wear quickly. Oil entering the torque signal orifice leaks past the boost valve and exhausts at the Reverse orifice, resulting in poor line rise. Reverse oil can exhaust both to the sump and back through the torque signal orifice. The outside diameter of the boost sleeve also allows some leakage through the pump body, which decreases pressure rise.\u003c\/p\u003e\n\n\u003cp\u003eSonnax boost valve kit 77898E-3K is an increased ratio assembly that will restore hydraulic integrity and prevent leakage in units with early-style pumps. Drop-in Zip Valve™ parts install quickly and easily. See chart for usage details and other boost valve options.\u003c\/p\u003e\n\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\u003eValve \u003cem\u003e.490\", No Groove\u003c\/em\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"break-out-grey\"\u003e\n\u003cdiv class=\"wrap scc\"\u003e\n\u003cdiv class=\"col-4\"\u003e\n\u003cp\u003e\u003cstrong\u003eSymptoms:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3-4 Clutch failure\u003c\/li\u003e\n\u003cli\u003e2-4 Band failure\u003c\/li\u003e\n\u003cli\u003eLow line rise\u003c\/li\u003e\n\u003cli\u003ePoor shift quality\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\nA worn boost sleeve can allow torque signal and Reverse oil cross-leakage or leakage to sump.\u003c\/div\u003e\n\u003cdiv class=\"col-4\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"col-4\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"col-4 last\"\u003e\u003cstrong\u003eCorrection:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"col-4 last\"\u003e \u003c\/div\u003e\n\u003cdiv class=\"col-4 last\"\u003eInstall Sonnax drop-in boost valve kit to restore hydraulic integrity and prevent leakage.\u003c\/div\u003e\n\u003cdiv class=\"col-4 last\"\u003e \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"break-out-accent break-out-accent-link\"\u003e\n\u003cdiv class=\"wrap\"\u003e\n\u003cp\u003e\u003cstrong\u003eWarning:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOE has made multiple pump design changes. Transmission will not function properly if the wrong length sleeve is installed. Verify length of OE sleeve and select Sonnax kit with equivalent sleeve length.\u003c\/p\u003e\n\n\u003ctable class=\"sans col-12\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e EPC Spool \u003c\/th\u003e\n\u003cth\u003e OE Valve\/Sleeve Design \u003c\/th\u003e\n\u003cth colspan=\"2\"\u003e Sonnax with O-Rings \u003c\/th\u003e\n\u003cth colspan=\"2\"\u003e Sonnax “Factory Style” \u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth colspan=\"6\"\u003e Early Style, 1.907\" Long Sleeve\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"2\"\u003e .421\"\u003c\/td\u003e\n\u003ctd\u003e Valve: 1 Band\u003c\/td\u003e\n\u003ctd class=\"text-center\" colspan=\"2\" rowspan=\"2\"\u003e\n\u003cp\u003e No Sonnax ratio available.\u003c\/p\u003e\n\u003cp class=\"omega\"\u003e Sonnax \u003ca href=\"..\/i-30503080-boost-valve-kit-early-style-470-dia-o-ring-style.html\"\u003e77898E-4K\u003c\/a\u003e may be used, but noticeably firmer shifts will occur.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd class=\"text-center\" colspan=\"2\" rowspan=\"2\"\u003e\n\u003cp\u003e No Sonnax ratio available.\u003c\/p\u003e\n\u003cp class=\"omega\"\u003e Sonnax \u003ca href=\"..\/i-30503079-boost-valve-kit-early-style-470-dia-factory-style.html\"\u003e77898E-6K\u003c\/a\u003e may be used, but noticeably firmer shifts will occur.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"2\"\u003e .470\"\u003c\/td\u003e\n\u003ctd\u003e Valve: 2 Bands\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30503080-boost-valve-kit-early-style-470-dia-o-ring-style.html\"\u003e77898E-4K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: 1 Groove\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30503079-boost-valve-kit-early-style-470-dia-factory-style.html\"\u003e77898E-6K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: 1 Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Sleeve: 1 Groove\u003c\/td\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"2\"\u003e .490\"\u003cbr\u003e Upgrade for OE .470\"\u003c\/td\u003e\n\u003ctd\u003e Valve: N\/A\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30503077-boost-valve-kit-early-style-490-dia-o-ring-style.html\"\u003e77898E-K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: No Groove\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30498059-4l60-65e-boost-valve-kit.html\"\u003e77898E-3K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: No Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Sleeve: N\/A\u003c\/td\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr class=\"thead-tr\"\u003e\n\u003cth colspan=\"6\"\u003e Late Style, 1.809\" Length (Short) Sleeve \u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"2\"\u003e .421\"\u003c\/td\u003e\n\u003ctd\u003e Valve: 3 Bands\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30503078-boost-valve-kit-late-style-421-dia-o-ring-style.html\"\u003e77898E-14K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: 3 Grooves\u003c\/td\u003e\n\u003ctd class=\"text-center\" colspan=\"2\" rowspan=\"2\"\u003e\n\u003cp\u003e No Sonnax ratio available.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003ctd\u003e Sleeve: No Groove\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd rowspan=\"2\"\u003e .472\"\u003c\/td\u003e\n\u003ctd\u003e Valve: 4 Bands\u003c\/td\u003e\n\u003ctd class=\"text-center\" rowspan=\"2\"\u003e \u003ca href=\"..\/i-30503081-boost-valve-kit-late-style-472-dia-o-ring-style.html\"\u003e77898E-16K\u003c\/a\u003e\n\u003c\/td\u003e\n\u003ctd\u003e Valve: 4 Grooves\u003c\/td\u003e\n\u003ctd class=\"text-center\" colspan=\"2\" rowspan=\"2\"\u003e\n\u003cp\u003e No Sonnax ratio available.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\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\/184155.pdf?v=1793634848\" 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":49129381626075,"sku":"SC-77898E-3K","price":53.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/4173\/0267\/files\/F198655764.jpg?v=1786543085","url":"https:\/\/suncoastperformance.com\/products\/boost-valve-kit-early-style-490-dia-factory-style","provider":"SunCoast Diesel","version":"1.0","type":"link"}