tranny shifts lare hard when cold.. bang ,, thd, whap...:( - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-14-2004, 12:15 AM   #11
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I just remembered, my car had very similar symptoms, I was at the wrong end of a 1,000 mile trip, so I drove it home like that and it got a lot worse. Hard shifts, especially at partial throttle, late shifts, things like that. I took it to the tranny guy, and he said my convertor was plugged, I asked how that could happen (assuming he meant the torque convertor), he looked at me kind of funny and explained he was talking about my exhaust system

Just a thought, your last post made me think of that as a possibility, and you do have a lot of miles on your car. Mine was plugged at only 65k miles.

Tom
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Old 12-17-2004, 08:29 PM   #12
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I just went through this on my 91. Had the cooling system flushed and all new coolant put in. The knucklehead at the dealership put in a 165 t-stat. Caused all kinds of shifting problems because the car had a hard time getting to closed loop. Thought maybe his problem might have been caused by the same thing.

Jake


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Originally Posted by Jakespeed
What thermastat do you have in the car? Is it the right one or have you or someone else changed it to a different temp setting?

Jake
What does the thermostat have to do with this? Factory for 3800'* is 195F... A lot of us run 180F thermostats... I have 180'* in both my 91 and 95 bonnevilles, never caused any issues in either car... The 91 has the THM440-T4(4T60) and the 95 had the 4T60-E..

Just wondering..
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