Harsh Lock-Up Shift Or Shudder
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: defective torque converter, sticking lock-up piston, burnt oil, worn oil pump bushing, PCM software not up to date (check for TSBs that may apply) or torque converter clutch failure.