GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

4-5-6 Clutch Assembly

    â€¢ Inspect for damaged or broken 4-5-6 Clutch Piston (433) and Piston Seals (430-432)
    â€¢ Inspect for broken or disengaged 4-5-6 Backing Plate Retainer (442)
    â€¢ Inspect for damaged or broken 4-5-6 Clutch Dam Piston (435) and piston seals damaged, worn or delaminating
    â€¢ Inspect for broken or disengaged 4-5-6 Clutch Dam Retainer (436)
    â€¢ Inspect for sheared or stripped splines on the Reaction Carrier Hub (438)
    â€¢ Inspect for sheared or stripped splines on 3-5-Rev/4-5-6 Housing to Turbine Shaft (422)
    â€¢ Inspect for loose, worn or damaged 3-5-Rev/4-5-6 Housing Bushing
    â€¢ Inspect for broken, porous or improper surface finish or plugged oil passages of the 3-5-Rev/4-5-6 Housing (422)
    â€¢ Inspect for failure of the Input Shaft Thrust Bearing (32)