GM Service Manual Online
For 1990-2009 cars only

Checks

Cause

Torque Converter (1)

    â€¢ Loose lug bolts
    â€¢ Out of balance
    â€¢ Internal failure

Transmission/Engine

Misaligned

Case Extension (19)

Output shaft support bushing is worn.

Reaction and Output Gear Sets

Flats on gear teeth or teeth improperly machined

Oil Pan

Dented