Harsh upshift from 3rd to 4th gear - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-20-2004, 09:50 PM   #1
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Default Harsh upshift from 3rd to 4th gear

Any bonnie owners experiencing harsh shifts from 3rd to 4th? 97 bonnie....111,000 miles. Its seems that if u "baby" it up to 46 mph....the shift is rough.but if u get on it...the shift is smooth. A pcm update maybe?
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Old 09-20-2004, 10:19 PM   #2
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I had that after I got my tranny rebuilt but its not really in those gears its at a certain RPM I think like 1500 - 3000 RPM like at highway speeds or if Im going a certain speed that keeps teh rpms in taht range.
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Old 09-20-2004, 10:33 PM   #3
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my 97 Riviera goes the same thing. I get a really bad surging as it'* shifting into OD. if I'm accelerating fast it'* fine just like yours. The surging on mine can be really bad at times though if I"m in OD and trying to accelerate without downshifting.
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Old 09-20-2004, 11:27 PM   #4
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http://calid.gm.com/

use your VIN to see if its possible to update your PCM.
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Old 09-20-2004, 11:27 PM   #5
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there is a TSB that addresses that problem, It is described as a 'Chuckle" by GM The correction is a chip called a MEM-CAL that changes the shift points
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Old 09-20-2004, 11:29 PM   #6
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Quote:
Originally Posted by 1993 SLE
there is a TSB that addresses that problem, It is described as a 'Chuckle" by GM The correction is a chip called a MEM-CAL that changes the shift points
"Chuggle"

And it MAY be that, or any number of other similar issues. Symptoms with trannies are hard to describe.
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Old 09-22-2004, 12:01 AM   #7
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My VIN is "invalid". Sometimes I really hate computers.
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Old 09-22-2004, 11:41 PM   #8
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chuggle is a funny word. Pretty sure nobody has ever come to the dealer describing a trans liek that.
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