The Mud Pit > Wrenching

'87 YJ Build

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calvynandhobbs:
On my CJ it was just a bad ujoint that I replaced and never had the problem again. What Adam just stated is also very true. Your vibration is coming from that general area. Rear driveshaft and ujoints are the vibration, but it could be from some axle wrap and loading and unloading the ujoints with the pinion angle you currently have. Did your lift come with wedges or have angles on the plate to account for the pinion angle change from being taller?

kirksjeep:
When you were over my place you mentioned that the Jeep still had the t-case drop kit installed.  With the drop kit it will throw your driveline angles off with a SYE.  Check out Tom Woods website for some insight on driveline angles with the SYE.  I had to pull the drop kit and go to different rear shims before  I did the 8.8 swap to get the vibrations gone.

Mr Rock:

--- Quote from: calvynandhobbs on August 21, 2012, 02:17:51 AM ---The last time I can think of something like that happening to me was when I had my CJ7. It was the rear driveshaft. When accelerating everything stayed tight, but when I let go of the gas it would create a void in pressure and the ujoint was vibrating. It was shot and after doing this for about 3 weeks the ujoint gave up the ghost and the rear driveshaft fell out on me while driving it.

--- End quote ---

X2 one of your rear ujoints is bad, also double check all the straps that hold the u-joints on.

gearhead1985B:
you need differnt wedges the ones you have are most likly for a jeep with no sye

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