HI,
Hope you trans experts can help
Background: 1999 Sable with DOHC AX4N, 77,000 miles. Car was running fine and shifting fine, transmission just stopped working at a stop sign. took out trans expecting to rebuild and found pump shaft splines in converter were stripped. Replaced torque converter with reman from NAPA.
Problem: car shifts just fine, but when driving at constant speed or very slight acceleration, the car will studder or shudder. no change in rpms. most of the shifts into 3 or OD will also have the slight shudder. No shudder over 60 mph. no shudder with hard acceleration.
I suspect it is related to torque converter lockup, but don't what makes lockup work.
any ideas on how to diagnose?
thanks
Tom
Hope you trans experts can help
Background: 1999 Sable with DOHC AX4N, 77,000 miles. Car was running fine and shifting fine, transmission just stopped working at a stop sign. took out trans expecting to rebuild and found pump shaft splines in converter were stripped. Replaced torque converter with reman from NAPA.
Problem: car shifts just fine, but when driving at constant speed or very slight acceleration, the car will studder or shudder. no change in rpms. most of the shifts into 3 or OD will also have the slight shudder. No shudder over 60 mph. no shudder with hard acceleration.
I suspect it is related to torque converter lockup, but don't what makes lockup work.
any ideas on how to diagnose?
thanks
Tom