GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

1-2-3-4 Clutch Assembly

    â€¢ Inspect for damaged or worn 1-2-3-4 clutch plates (456-458).
    â€¢ Inspect for damaged or broken 1-2-3-4 clutch piston (461) and piston seals damaged, worn or delaminating
    â€¢ Inspect for broken or binding 1-2-3-4 clutch piston return spring (460)
    â€¢ Inspect for broken or disengaged 1-2-3-4 clutch piston return spring retainer (459)

Output Sun Gear Assembly (457)

Inspect for stripped or sheared splines on the Output Sun Gear shell

Reaction Carrier Assembly (467)

    â€¢ Inspect for stripped or sheared splines on the Input Ring Gear
    â€¢ Inspect for disengaged or broken Input Ring Gear Retainer

Output Carrier Assembly (474)

    â€¢ Low/Reverse Clutch Assembly (OWC) (455) splines sheared or broken
    â€¢ Inspect for disengaged or broken Reaction Ring Gear Retainer