New Member with what looks to be a familar Overdrive problem
Hello! I happened across this forum while trying to find an answer to my troubles and hope someone can be of help. Looks like this issue has been covered quite a bit on here but after reading though multiple posts I'm still looking for a solution. I have a 1994 Bonneville SE that I puchased last year with the issue that it would drop out of overdrive after driving at highway speed. So after taking it to a local transmission shop they recommended a rebuild as it was showing a torque converter code. So I had them rebuild the whole transmission...only to not have the issue solved. I've had it back twice since then, the first time they said was because the converter they installed was bad, so it was replaced and now the issue happens infrequently but still occurs. The second time they tested it for about a week and decided that it may be temperature related so they installed an external trans cooler. I just took the car on a long trip and sad to say it is still dropping out of overdrive. When I first start driving everything works great until everything is warmed up, or as on the trip I'd have it in cruise until I would need to slow down or turn the cruise off and I'd loose overdrive. If I stop somewhere and let the car sit, it will shift back into overdrive until eventually it drops out again. It'* the difference between 2k and 3k so I know when it'* not working. What else could the issue be? Trans parts should be new, it'* got a cooler, fluid is new. Please if anyone has any thoughts they would be appreciated. I'll be taking the car back but it'* just getting frustating. Thanks for looking!