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Old 01-14-2017, 07:07 PM
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KTJ
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Vibration

Ok here's the scoop.
My tj is NOT lifted. I was off reading when apparently I broke the rear driveshaft. I picked one up at a junkyard (same size) and replaced it myself. Jeep is vibrating. I had the driveshaft balanced and replaced tranny mount. Still vibrating. When I drove the jeep w/o rear shaft it didn't vibrate. Motor mounts look fine. Any ideas??

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Old 01-14-2017, 07:32 PM   #2
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How did you break the driveshaft? And where did it break exactly?

Could be u joints. Could be whatever you did to break the driveshaft bent something else.

When they balanced the driveshaft, did they also check it for straightness?

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Old 01-14-2017, 09:05 PM   #3
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Check your rear control arm mounts for broken welds or bending...both upper and lowers on both axle and frame.
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Old 01-14-2017, 09:10 PM   #4
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Probably a bad shaft. It shouldn't need to be balanced. It's either the U-joints or the shaft is bent. You can get an aftermarket heavy duty shaft from adams for under $300. I am running their front shaft after an issue with my front shaft (slip joint) and it got rid of all of my vibrations
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Old 01-15-2017, 03:19 PM   #5
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Definitely the shaft, try ordering a new one!
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Old 01-15-2017, 03:53 PM   #6
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If you hit something hard enough to break a drive shaft, you could also have damaged control arms or mounts, which would alter pinion angle, thus causing vibrations.
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Old 01-15-2017, 07:46 PM   #7
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Was there any change at all after balancing the shaft? Check the pinion yoke and bearing, they may have suffered damage from the strain. A damaged bearing can cause some play, which will show up as vibrations as it flops around.

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