95 RMW Vibration When Above 4,000 rpm - Chevy Impala Forums
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post #1 of (permalink) Old 06-20-2015, 05:07 PM Thread Starter
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95 RMW Vibration When Above 4,000 rpm

I had my 4L60E rebuilt in January when the reverse cone splines stripped--which I've heard is a common problem with this year.

Now the transmission shifts very well through all four speeds and the lockup works on the highway. However, if I accelerate fast enough to get the rpms above 4000, there is a severe vibration in the drivetrain. The vibration occurs in all four gears above about 4000 rpm. I did not have this problem before the transmission rebuild. When revving the engine in neutral, there is no vibration.

If you drive the car normally--no downshifts or fast acceleration--you'd never know there was a problem.

I suspect the torque converter is the problem, as it was changed with the rebuild and it makes sense to me that it would cause a problem like this.

Any ideas?
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post #2 of (permalink) Old 06-22-2015, 03:10 PM
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I was thinking either that or motor and tranny mounts

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post #3 of (permalink) Old 06-22-2015, 09:45 PM Thread Starter
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I posted this on another forum and most think it's a driveshaft problem. If it was, it wouldn't vibrate in first, second, and third only when engine rpm's are above 4000.

There is no vibration at high speeds (70-100 mph) in fourth gear. It only vibrates if rpms get higher than 4000.
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post #4 of (permalink) Old 06-23-2015, 08:44 AM
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I'd start by checking all of your mounts, one may have gone when the tranny was out. There is usually rubber in them and it is probably really old. Besides, checking them doesn't cost anything or not much at all. If they are good, then they are good and we can go from there.

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post #5 of (permalink) Old 06-26-2015, 08:32 PM
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i will be away for a few days but if you want to drive up to Greenville next week I could take a look?
Being same rpm in every gear but not neutral as you describe makes me worry bout something in the front half of the tranny, maybe in combination with a soft engine or tranny mount?

Dwayne
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