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Unread 11-30-2001, 04:21 AM   #1
bonehead99
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1994 YJ Wrangler 
 
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94 YJ vibration

I recently installed a RC 3" lift kit and when I'm going 45-52 mph I get a vibration. It feels like the rear driveshaft, I also have 2" shackles. Could I need another degree of shim?

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Unread 11-30-2001, 07:12 AM   #2
gifargis
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You either have to place a SYE kit to illiminate the problem and change the drive shaft to accomidate the longer length.. or I just threw a 15 degree shimmy under my leaf spring to get the correct angle...
That could be one problem .

Did you lower the transfer case?
if not, this is problem number two

sargon
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Unread 11-30-2001, 08:51 AM   #3
bonehead99
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I did lower the t-case. Does it matter that the spring already have a shim, can put another shim on top of it?
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Unread 11-30-2001, 09:21 AM   #4
osburn
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I'm assuming the tcase drop and the shims came in a kit. If so, it's probably not angle, it's probably a u-joint failing on you. Get under there and shake the crap out of the driveshaft. There shouldn't be any play other than a slight amount of rotation.
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Unread 12-01-2001, 09:31 AM   #5
Brendan
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If you have a 3" suspension and 1" shackle lift, you are asking for vibration. Dropping the T-case decreases your ground cleareance, and can affect your shifting. Just save for the slip yoke eliminator kit. It will solve most of those vibration problems. With shims you are temporarily fixing a problem that will need permanent fixing later.
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Unread 12-01-2001, 11:34 AM   #6
osburn
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I'm glad you replied to this Brendan, cause it made me read it again. I didn't catch it was a newly installed lift the first time around for some reason.

First, DO NOT stack shims! Bad enough ya gotta slip something between your springs and perches as it is. Expect to install a longer center pin on your springs when you add a thicker shim. The center pin needs to go thru the shim and into the perch.

I'd suggest you get under your Jeep with an angle finder (cheap tool to buy) and measure your driveshaft angle and the angles of your yokes. Figure out how much shim you need and slip them in.

If it were my Jeep, the lift shackles would be outta there! They're probably the worst way to obtain lift.
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