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Unread 11-17-2002, 09:17 AM   #1
75jeepcj
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vibration while driving

There has been a vibration in my jeep that has been coming and going. Sometimes its there while I drive slow but more often when im in 3rd gear(3speed trans) going over about 35mph. Dont know if it is the transmission, the rear end, or maybe just an unbalanced wheel. Any suggestions on where the problem may be are appreciated.

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Unread 11-17-2002, 12:12 PM   #2
BESRK
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Could be any number of things. Do you have a lift? Has it (the bad vibe) been there for a long time? Did it start after a recent modification (lift? new tires?). Does it seem like it's coming from the front or rear? If it starts and you shift into neutral is it still there? I would check the driveshaft universal joints first. Also check to see if all the wheels have their balance weights. Check for general sloppiness in things like tie rods, ball joints, wheel bearings. Hopefully you'll home in on it.
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Unread 11-18-2002, 04:42 PM   #3
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just put a 1 1/2 inch lift and i'm pretty sure its coming from the back wheel(s)
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Unread 11-18-2002, 05:53 PM   #4
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I wouldn't think that a 1.5" lift would affect driveshaft angles enough to cause vibration but who knows? I would make sure that the transfer case output yoke and rear axle pinion yoke are on the same plane or with the pinion pointed about 1-2 degrees lower. If the lift caused your rearend's pinion to point up a little it may have induced a driveshaft vibration.
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'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..

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Lower 2

Guardrail

Down Schoolbus

Slickrock Tellico

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Crozet

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Unread 11-18-2002, 09:27 PM   #5
SamFromCO
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What type of lift did you put on (spring, shackle, or body)? Have you checked your u-joints?
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Unread 11-19-2002, 08:07 AM   #6
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I would make sure that the u-bolts and springs are all seated correctly, and not loose. If something is able to move around back there, it will vibraite a lot.

A quick and cheap way to tell (assuming everything is bolted correctly) if the mild lift its self is the cause (could be on such a short CJ-5), is to throw a couple of hundred pounds in the back, effectively compressing the springs, lets say 2". If there is then no vibraition, the angle is too great, at least for the u-joints you have in.

Good luck
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