Question about lift and vibrations -
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post #1 of 3 Old 03-12-2010, 09:09 AM Thread Starter
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Question about lift and vibrations

I installed a RE 4" lift on my yj. I also installed the TC drop kit that came with it as well as the 4* shims. I have vibrations in 4th and 5th gear AND 5th gear seems to have no power. I measured the drive line angles as best I could and got a reading of 6* at the TC and 9* at the rear. It would seem that my pinion is too high correct (SHOULD be 6-2=4 if I have studied correctly) So, I would assume that removing the 4* shims SHOULD get it a lot closer to correct and lessen the vibrations. (assuming that removing the 4* shims puts the rear angle at 5*)

Here is my dilema. Two days ago I carried two bicycles on a rear hitch bike rack to work with me. I noticed as I drove that there were NO vibrations and 5th gear had plenty of power (never bogged down even climbing small grades) Seems to me adding weight to the rear of the jeep would raise the pinion angle which totally contradicts needing to remove the shims.

Or am I just confused ? (and maybe stuck carrying a loaded bike rack around all the time :~> )

All help appreciated,


1994 YJ, 4.0, 5 speed.

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post #2 of 3 Old 03-12-2010, 10:26 AM
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1988 YJ Wrangler 
Join Date: Sep 2008
Location: Jacksonville, FL
Posts: 10
Check out Tom Woods site; Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist my understatnding is that the angle should match if your're using the stock driveshaft. The load on the rear of your jeep is probably decreasing the u-joint angle. just my 2 cents.
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post #3 of 3 Old 03-12-2010, 10:27 AM
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1988 YJ Wrangler 
Join Date: Sep 2008
Location: Jacksonville, FL
Posts: 10
oh yeh, it's under "Tech info" on the site. click on Geometry 101
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