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post #1 of 2 Old 08-18-2002, 11:35 AM Thread Starter
wadger
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Strange vibrations

My 1995 GC is making some strange shimmies. If I rev the engine up to around 1250 rpms in park, the vehicle vibrates quite a bit - you can especially feel the vibration through the steering wheel. If its just idling or if I rev the engine over 2000 rpms, the vibration isn't noticeable. The same thing happens on the highway, if I'm around 1250-1500 rpms I feel the shudder. If I accelerate over that, or let my foot off the gas the vibration goes away. I really don't have much mechanical experience, but I think I can eliminate the vibration coming from the suspension and wheels. Is this correct? Any suggestions would be appreciated.

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post #2 of 2 Old 08-20-2002, 07:14 PM Thread Starter
wadger
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Bob J,

Alright, from what I can tell there are three mounts that I should be concerned with - right and left engine mount and a rear (transmission?) mount. I examined the engine while it was idling and I couldn't see any play in the left (driver side) mount. The right side seemed to be shaking (front to back) with about 1/8" - maybe a hair more of play. The transmission mount didn't seem to be moving. When I had someone sit in the cab and rev the engine to about 1250 rpms (where the vibration can be felt the most through the steering wheel) I couldn't see any play in any of the mounts. The engine doesn't seem to be moving around suspiciously. I did notice that the transfer case and the drive shaft leading back to the rear differential were wobbling with maybe 1/2" of play when idling, but were pretty still while the engine was revved. I checked the service manual and sure enough it said that damaged engine and transmission support mounts were most likely the culprit since the vibration was only engine speed sensitive. However, it also listed engine driven accessories (possibly loose brackets on these accessories) as a possible
problem.

I'm really not sure how to examine the mounts further without removing them. Is this warranted?
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