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Unread 02-24-2004, 07:03 AM   #1
NJCJ7
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Join Date: Jun 2003
Posts: 295
vibration at speed: u-joints?

the cj's been having some pretty bad vibrations at hiway speeds. Engine's smooth as silk, so i am thinking drivetrain somewhere. Would new u-joints fix this? there is also a kind of ringing sound sometimes when i let off the gas... seems i read somewhere that that was a sign of u-joints being bad too... any input appreciated...

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[color=blue][b]1985 CJ7[/color][/b] MC2100,TFI, 2.5" BDS suspension, Full Cage, 31" Mud Tires, 1/2" MORE shackles, Aussie Locked AMC 20
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Unread 02-24-2004, 10:09 AM   #2
jeepmor
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good call

Sounds right, that ringing sound is a clunk from the u-joint due to wear, letting off the gas makes it go from driving to driven, and the slop is the clunk, the resulting noies is travelling into the driveline, making it a bell of sort. Climb under the rig and try to move the joint, it should be obvious which it is once your under the rig. There should be no slop in the u-joint, if there is, replace it. And since you'll have the driveshaft out, replace both the tranny and diff end.

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Last edited by jeepmor; 02-24-2004 at 10:15 AM..
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Unread 02-25-2004, 05:43 PM   #3
SNiPeRX
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I agree 100% I have a 84 cj7, and sunday i replaced my U Joint, and its running great now. I heard a rattling sound when i would let off the gas. The sure way to figure out if thats your problem is to put it in reverse, it will make a clank sound when you begin to move, or just climb under your car and shake the drive shaft. But im almost 100% sure that your problem is your U joint.
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Unread 02-26-2004, 06:29 PM   #4
Lightningdon
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One other thing to think about......I had noise and vibration in my CJ. I finally tracked it to the input shaft bearing in my tranny. Just don't overlook that possibility.
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