SPONSORED LINKS

1990 Pontiac Grand Prix automatic transmission

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1990 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
1990 Pontiac Grand Prix mileage: 131,000. I had the transmission serviced (fluid replaced) by our regular mechanic. After servicing it drove very rough when the automatic transmission would down shift it made you pitch forward/lurching as you slowed. I returned to the mechanic and he checked it over and stated that the only thing to do was to disengage the torque converter? This performs the shifting for an automatic transmission. Any other suggestions?
SPONSORED LINKS
Wednesday, October 20th, 2010 AT 5:42 PM

1 Reply

Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
Your car has a lock-up torque converter in the transmission. It locks-up only in high gear. It is supposed to disengage at lower speeds. Yours is not disengaging. There is probably a valve in the transmission “hanging up”. The torque converter is controlled by the TCC (Tongue converter clutch) solenoid. Replacing it should fix your problems.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, October 20th, 2010 AT 6:03 PM

Please login or register to post a reply.

Related Transmission Torque Converter Content

How a Torque Converter Works
GUIDE
How a Torque Converter Works
The torque converter is designed to act as a fluid coupler that can engage and disengage with the increase and decrease of engine rpm. When the vehicle is not in motion...
VIEW MORE

Sponsored links