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Old 03-25-2012, 07:52 AM   #1
Join Date: Feb 2011
Location: Michigan
Posts: 12
I could use some HELP

My '87 YJ with a 2.5, 5 speed has developed a hard vibration starting about 1750 rpm in 3rd. gear through all of 4th. gear. It isn't noticeable in the lower gears, and doesn't do it in the 'bottom half' of 3rd. I replaced the u-joints thinking that was it, but 'no joy'. Any help, ideas?

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Old 03-25-2012, 10:58 AM   #2
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It's possibly your clutch and/or fly wheel.

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Old 03-26-2012, 06:38 PM   #3
Join Date: Feb 2011
Location: Michigan
Posts: 12
Is it possible that my clutch could be warped?
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Old 03-26-2012, 07:51 PM   #4
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Does the vibration go away if you push in the clutch?
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Old 03-26-2012, 08:02 PM   #5
Join Date: Aug 2011
Location: Central Maine
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The two bolts in the upper half of the transmission mount that thread into the transmission are notorious for coming loose and often falling out. When they do your transmission will just wiggle around on top of the mount depending on torque applied. You should also check for loose or broken motor mounts if you haven't already.

Someone else on here has the tranny mount issue, check out this thread.
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Old 03-27-2012, 05:59 AM   #6
Join Date: Feb 2011
Location: Michigan
Posts: 12
Thanks for the help, I'll crawl under today and check these items first.

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