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The SON-34322-02K is the Sonnax extreme duty forward clutch hub kit for GM TH400, TH425, 4L80-E and 4L85-E transmissions. This hub is manufactured from forged 4140 steel and features nitrited and case-hardened splines to eliminate spline wear in extreme applications.
The SON-34322-02K kit includes a bearing between hub and direct clutch housing. The case-hardening at bearing surfaces is removed to make further modifications easier. This forward clutch hub and bearing combination shifts the support of the forward clutch hub from the main shaft to the direct housing and sun gear shaft.When comparing the SON-34322-02K to an OE hub, you will find the Sonnax extreme duty forward clutch hub kit 34322-02K has an additional 0.025” thickness designed-in to reduce endplay and provide further endplay adjustment options. No machining is required for typical installation.This hub features 0.055” of additional outer spline length to allow additional clutch with shortened piston. This added length does not interfere with normal piston travel and can be used with any piston without modifications.
