GM Service Manual Online
For 1990-2009 cars only

Checks

Causes

Input Shaft Assembly

Inspect thrust washers, and ring gear for wear damage.

Sun Gear Carrier Assembly 1st - 2nd Position

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

1-3R Clutch Housing Assembly and Variable High 2-3-4 Clutch Assembly

Inspect for worn or damaged clutch bearing.