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Old 05-09-2010, 09:42 PM   #1
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bad vibes!!!!!!!!!!!!!??????????????

this just started happening the other day vibrates a lot under acceleration. and i let off and its smooth???????????? any suggestions?????

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Old 05-09-2010, 09:44 PM   #2
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Sounds like either a u-joint on the rear driveshaft has gone bad, or the rear pinion angle has been adjusted so it is too high.

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Old 05-09-2010, 09:46 PM   #3
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How do you check if it's the u-joint, Jerry?
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Old 05-09-2010, 09:52 PM   #4
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i didn't adjust anything it just started doing it
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Old 05-09-2010, 10:14 PM   #5
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Tiny, you can check a u-joint by moving it to see if there is any unwanted movement like would happen if some of the needle bearings are toast. Another sure sign of a bad u-joint is rusty dust coming out of one of the bearing caps. When they go bad enough to cause a dramatic problem like 2004wranglerRHD's, it's not normally hard to find the bad u-joint if that is the problem.

2003WranglerRHD, I would unbolt the rear driveshaft and move the u-joints around to see if they feel secure & tight. Good u-joints will have no movement other than where they are supposed to rotate and then it should be somewhat stiff if the grease inside is in good condition.

They do go bad, that is for sure. A very good Spicer sealed (what I recommend) replacement u-joint is p/n 5-785x.
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Old 05-10-2010, 07:01 AM   #6
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thanks man i think ill try that today
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Old 05-10-2010, 02:06 PM   #7
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its fixed the u-joint was almost wore right off good thing you guys are here cap was broke and no grease all rust!!!!!!! thanks again!!!!!
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Old 05-10-2010, 02:13 PM   #8
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To what jerry said but I have actually found it easier to check u-joints while they are still in the jeep. A driveshaft or axle should be pretty stiff axle more so. My rear drive shaft felt fine good out of the jeep but in the jeep it could move all over the place. Just a FYI

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