GM Service Manual Online
For 1990-2009 cars only

Torque Converter Clutch Shudder

Checks

Cause

Converter Clutch Apply Valve

Sticking

Converter Clutch Apply Passage

Restricted

Oil Pressure

Low

Engine Mechanical, Emissions, Electrical & Fuel Delivery Systems

Improper Operation

Turbine Shift O-ring

Cut or leaking