Shifting hard - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-16-2005, 01:28 AM   #1
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Default Shifting hard

i got a 1995 bonneville and i just left my friends house one nighti turned out the street and then it started shifting real hard felt like it was sticking i had this problem before with my SE 1994 but it did the same thing but i let it go for like a couple of weeks then one night i went threw jenks and i wasnt even driving fast or anything then all the sudden i hear a weird sound then all the sudden my transmission goes and transimisson fluid filled the street up my dad tore it apart and he said something about the housing being messed up if u give me any hints of what might it be thanks!
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Old 05-16-2005, 02:37 AM   #2
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holy run-on sentence...

could be the 495hp you are putting out to it
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Old 05-16-2005, 03:00 AM   #3
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nah thats my brother 95 sesc not mine mines stock with magnaflow Exhuast thats it but hey fi u got any answers thanks
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Old 05-16-2005, 08:34 AM   #4
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My suggestion would be start simple, check the fluid according to the owners manual. While looking/filling look closely for any metal fragments on the dipstick.

Then aim to find consistency. Consistency helps determine exactly what the problem is.
Has it done it since or was this an isolated incident?
Does it do it always on corners? If so which way or both ways?
Do you beat it/have you beaten it? (Just helps to understand what to expect)
Have you had a fluid and filter change lately/ever?
What are the miles on the car or tranny?
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Old 08-17-2005, 02:53 PM   #5
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My mom'* trans has had kinda the same problem. When accelerating, it goes above the normal revs to shift and then shifts hard. It developed suddenly after a couple hours of looking for a car for me. The fluid shows as over an inch above max fill. It have about 70K miles on it, and it has never had a refill/filter, unless uncle ben'* does them. Please point me in a direction.
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Old 08-17-2005, 03:39 PM   #6
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Quote:
Originally Posted by Falcon123
My mom'* trans has had kinda the same problem. When accelerating, it goes above the normal revs to shift and then shifts hard. It developed suddenly after a couple hours of looking for a car for me. The fluid shows as over an inch above max fill. It have about 70K miles on it, and it has never had a refill/filter, unless uncle ben'* does them. Please point me in a direction.
In the future..if you are looking around and see stuff about a month or so old, start up a fresh thread and list your problem. This way you can get better exposure and answers.

Uncle Ben'*???? I thought they only made rice.

I'd start with the standard automatic transmission service. Should include dropping the transmission pan, changing the filter and refilling. Possilbly add some Lucas trans conditioner.
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Old 08-17-2005, 03:50 PM   #7
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trying. Thanks for the quick reply
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Old 08-17-2005, 08:25 PM   #8
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Check for codes. When a trans controller puts the trans into limp home mode it will usually command the line pressure to max inorder to TRY to stop any further damage.

At full line pressure a transmission will shift very hard. If limp home mode has been activated, there will be a trouble code set.
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Old 08-18-2005, 01:36 AM   #9
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on ur game today ur right it was the transmission cables when my brother was messing with my CAI he must nocked something loose
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Old 08-18-2005, 02:05 AM   #10
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A vacuum leak at the modulator will also cause harsh shifts. Store that in memory for a later date.
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