post #1 of Old 10-31-2012, 11:06 AM Thread Starter
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1991 YJ Wrangler 
Join Date: Oct 2012
Location: Tampa
Posts: 2
vibration at 40 mph

I recently installed a RC 2 1/2 in. suspension lift with 1 in. shackles I dropped the t case but im still getting vibrations accelerating from 35-40. The slower i go through that 35 to 40mph range the less noticeable the vibrations are and the faster I go accelerate to 40 the worse it is. If it makes any difference i feel the vibrations right under my feet.

Any help would be greatly appreciated.

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post #2 of Old 10-31-2012, 11:15 AM
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1988 YJ Wrangler 
Join Date: Sep 2010
Location: Cortez
Posts: 6,847
that 3 1/2" was probably enough to misalign your rear driveshaft even with the t-case drop. Easy fix is some degree shims on the rear axle. Best fix ($500) is SYE and CV driveshaft. It can be done a bit cheaper with an XJ rear driveshaft cit to fit with the Slip Yoke Eliminator.
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