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Vehicle Info Needed35723HD-02 Heavy Duty Intermediate Overrun Clutch Outer Race for TH350/TH350C
Ships on Sep 14, 2026
Lowest Price Guarantee- Heavy Duty Intermediate Overrun Clutch Outer Race
- TH350/TH350C
- OE Part No. 6261021
Sonnax 35723HD-02 Features:
A revolutionary upgrade for GM TH350 and TH350C performance vehicles, Sonnax heavy duty intermediate overrun clutch outer race 35723HD-02 delivers twice the torque capacity of any OE or other aftermarket race for unrivaled reliability at any power level.
Race failure is a chronic problem with TH350 transmissions. High torque loads cause the race to fracture at two stress points: the radial lube holes that contact the rollers and the sharp inside corners at the base of the outer splines. Despite many attempts to create improved versions, most aftermarket races were never significantly tougher than used OE parts.
Sonnax looked at all the issues to develop an upgraded outer race proven to eliminate every weak point. Lube holes are offset so rollers never travel directly over the holes. They’re also spaced so only one roller is ever positioned near a hole. Both features radically reduce risk of fracture. Design improvements to the splines, plus upgraded material and a custom manufacturing process, further improve durability to make this heavy duty race the best option available for the TH350 and TH350C.
- Double the torque capacity of OE or other aftermarket races
- Improved design significantly reduces risk of fracture at lube holes and splines
- Case-hardened steel alloy outperforms brittle, hardened aftermarket races
- Direct replacement race reduces need for expensive sprag conversions
Unmatched Durability
Sonnax Heavy-Duty Intermediate Overrun Clutch Outer Race are meticulously designed to eliminate weak points and prevent failures under high-torque loads. Common issues like race fractures are addressed through innovative engineering, including offset lube holes that ensure rollers do not travel directly over them, reducing stress and the risk of fractures. Enhanced spline design, upgraded materials, and a specialized manufacturing process significantly improve durability, effectively doubling the torque capacity compared to OE or other aftermarket races.
