GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Input Shaft Assembly (64)

Inspect thrust washers, and ring gear for wear damage.

Sun Gear Carrier Assembly 1st - 2nd - 3rd Position (67, 77, 434)

Inspect thrust washers, pinion gears, and pins for wear damage.

1-3 Clutch Housing Assembly (80) and 2-3-4 Clutch Assembly (471)

Inspect for worn or damaged clutch bearing.