"Maximum Duty Planetary" - 2.05-1.34 Ratio

MAXIMUM DUTY PLANETARY

• Straight cut output carrier
• Includes helical reaction ring gear
• Use w/ OEM reaction carrier
• 3-speed ratio 2.05-1.34
• 2-speed ratio 1.34

The Coan Racing “Maximum Duty Planetary” kit with straight-cut output carrier (ratios 2.05–1.34 for 3-speed and 1.34 for 2-speed) is a high-strength upgrade designed for serious Turbo Hydramatic 400 builds. This system delivers robust load-handling through a proven geartrain configuration. The straight-cut gears included in this assembly offer superior tooth engagement and distribute torque loads more evenly, significantly lowering the risk of gear fatigue in high-power applications. Built to handle racing-level stress, this kit provides predictable performance through consistently crisp shifts and improved drivetrain response.

Coan’s American-made construction and precision machining ensure that the planetary set drops into place without additional machining or alterations, perfect for race-prep or aggressive street-thrill builds. Whether competing in bracket drag, road-racing, or restoring resilience to a high-mileage build, this Maximum Duty planetary upgrade elevates strength, reliability, and geartrain excellence in the TH400 platform.