Shaking over 60, how can I tell if my u joints are off? - JeepForum.com
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Unread 05-31-2012, 03:48 PM   #1
Bmason31
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1996 ZJ 
 
Join Date: May 2012
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Shaking over 60, how can I tell if my u joints are off?

Just rebuilt the zj 5.2 1996 from a blown head gasket, and had to take off the drive shaft tow it. It sat for 3 years before I picked it up, then I drove it for about a month before it started overheating. Found tranny fluid in the engine, swapped the radiator and of course all new gaskets. Now, while I drove it the first month, it never shook once.

Now that I've sewn everything back together, it's running fine but once I'm going above about 62mph, I get shakes which increase with speed and stop only when I drop below the 62mph mark. If my U joints were off (although I marked the drive shaft before removal to assure it was put back right) could this be the cause? I would have said alignment/rotate and balance, but it never shook until I rebuilt it, so it seems to me that that's got to be the cause. Any thoughts?

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Unread 05-31-2012, 04:20 PM   #2
hdrocknroll
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Seems like if it were a U joint it would vibrate before it hit 62
Have U checked Front wheel bearing assemblies ?
Did U rebuild the drive shaft joints?
Do you have CV or all U joints?
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Unread 05-31-2012, 04:59 PM   #3
FAlfani81
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My 93 shook all kinds of crazy with the front drive shaft in when I first got it. Turned out to be all 4 front control arm bushings were completely dry rotted. The upper bushings are the ones that seemed to cause the most shake in mine.
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Unread 05-31-2012, 05:31 PM   #4
Bmason31
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I agree about the u joints; it seems like it would shake the whole time. See, that's the thing, I never touched anything to do with the frame, axles, or cv joints. For it to start shaking now, only and immediately after the rebuild, it seems strange that it would be caused by something else. I had it up on a jack overnight, and for some extended time during the job, maybe that threw it out of whack?

As to your questions, I didn't rebuild the shaft joints, I'm pretty sure it's all u-joints, and haven't even looked at the wheel bearings.
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Unread 05-31-2012, 05:33 PM   #5
ratmonkey
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sat for 3 years without moving on the same tires? time for new tires
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Unread 05-31-2012, 05:36 PM   #6
Bmason31
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Control arm bushings. Got it. Looks that up
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Unread 05-31-2012, 05:45 PM   #7
Bmason31
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@ratmonkey, I'd agree that it could use new tires if it sat for that long, only it didn't shake for a whole month of driving before the rebuild, which indicates to me that it wasn't a pre-existing condition. They look good, plenty of tread, and no "squaring", btw.
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Unread 05-31-2012, 07:21 PM   #8
Candymancan
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New tires. old ones are probably dry rotted.. I also found replacing my lower control arms recently reduced my vibrations at 60-70mph by like 70%, and replacing my transmission mount did the same. It could just be rotted bushings.
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Unread 05-31-2012, 11:11 PM   #9
mr4x4
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Tires
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Unread 06-01-2012, 07:09 AM   #10
KoreaZJ
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Rotted tires may seem good at first, later ply separation can cause problems.
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Unread 06-01-2012, 08:31 AM   #11
yzjwk
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My experience is I've had that twice on mine and i could only feel the shake over 60 .both times it was one of the u-joints at the diff .1 front and 1 rear .
Just slide under and push up on the drive shafts at either end closer to the u-joints .They should be tight as a drum .As little as 1/16 -1/8 " movement and it's probably time to change . Also check the cv or cardian in the front D.S .
Oh , and make sure there's no mud or anything like that slumped on the inside of the rims , that'll throw the ballance off too .but i do agree with bad tires as option as well . If the tires/tread are still good , it may be worth it to you to get them load ballanced .That should tell the story there if there's de-laminating going on .
good luck
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Unread 06-01-2012, 10:08 AM   #12
Bmason31
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Thanks, yzjwk. That's great info. I'll post results as soon as I check it out.
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