GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

Oil Level

    • Incorrect level
    • External leaks

Forward Clutch (624-634)

The feed in the input shaft is restricted (may occur with a cold engine at a fast engine idle) (624)

Case Cover (401)

    • A leak has occurred between the case cover and the driven sprocket support passages (401)
    • Incorrect gaskets are between the case cover and the driven sprocket support passages (401, 416)