tranny shifts lare hard when cold.. bang ,, thd, whap...:(
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Posts like a V-Tak
Joined: Nov 2004
Posts: 93
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From: Valparaiso Indiana
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
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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Joined: Feb 2004
Posts: 2
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From: Fillmore, California
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
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..
Jake
Originally Posted by jr's3800
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
Jake
Just wondering..
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eltatertoto
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Dec 5, 2013 06:19 AM