GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

4th Clutch Assembly

    • Inspect for damaged or worn clutch plates.
    • Inspect for damaged piston, piston dam, dam retaining ring, and clutch spring.
    • Inspect for improper selective 4th clutch backing plate retaining ring.
    • Inspect for cut, worn, or damaged turbine shaft fluid seal rings.
    • Inspect for damaged or distorted turbine shaft.

Control Valve Upper Body Assembly

Inspect the 12-3-4 clutch regulator valve and spring for wear or damage.

Output Shaft Assembly

Inspect for damaged or stripped internal splines on the output shaft assembly.