GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

1-2-3-4 Clutch Assembly

    • Inspect for damaged, stripped or sheared splines on 1-2-3-4 Clutch Plates (557-559), Backing Plate (560)
    • Inspect for damaged or broken 1-2-3-4 Clutch Piston (552) and Piston Seals damaged, worn or delaminating
    • Inspect for broken or fatigued 1-2-3-4 Clutch Piston Return Spring (553)
    • Inspect for broken or disengaged 1-2-3-4 Clutch Piston Return Spring Retainer (554)
    • Inspect for broken or fatigued 1-2-3-4 Clutch Waved Plate (557)
    • Inspect for disengaged or broken 1-2-3-4 Clutch Backing Plate Retainer (561)
    • Inspect for broken, porous or improper surface finish or plugged oil passages of the Low-Reverse/1-2-3-4 Clutch Housing (551)
    • Inspect for worn or damaged Low-Reverse/ 1-2-3-4 Clutch Housing (551) splines

Output Sun Gear Assembly (555)

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

Reaction Carrier Assembly (567)

    • Inspect for stripped or sheared splines on the Input Ring Gear
    • Inspect for disengaged or broken Input Ring Gear Retainer

Output Carrier Assembly (574)

    • Low/Reverse Clutch Assembly (OWC) (543) splines stripped or sheared
    • Inspect for disengaged or broken Reaction Ring Gear Retainer

Case Assembly (50)

  1. Inspect for leaking or loose fitting Fluid Check Valve (55)
  2. Inspect for leaking or damaged 1-2-3-4 and Low-Reverse Clutch Fluid Passage Seals (67)
  3. Inspect for worn or damaged case splines or retainer ring grooves