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post #1 of (permalink) Old 09-12-2000, 07:11 AM
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i just installed a Rustys 3.5" lift on my 95' yj (HT) and i am now experiencing a bad vibration underneath my floor pan. i dont have any swaybars or trackbars installed. I also installed a Xfer-case drop kit. when i start to pull forward, i get this repetitive "thump, thump, thump" underneath. it gets louder and closer together the faster i go. it has progressively been getting worse . i can hear it faintly even when i press in the clutch. i looked under the jeep yesterday, and found a mount that is on the skidplate that has rubber bushings on it on the driver side, that was loose. so i tightend it up a bit. also, there are 2 bolts (nuts) under the skid plate that connect to the Xfer-case, and there is room for it to move forward and back. should i loosen these nuts, let the xfer-case settle and then re-tighten. whats going on here? what do i do? how much $?

Crock 95' YJ (HT), 3.5" sus lift, 3" body (i know i know), 33" MT's, bad vibro prob.

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post #2 of (permalink) Old 09-12-2000, 07:40 AM
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Re: Vibrations

sounds like you have a drive line binding, the thump thump sound you hear is probably the u-joints. The torque limiter bar you have *tightened* should be a little loose to limit torque but not tight enough to bind or pull tranny to the left. The tranny bolts in the skid plate you refere to ,, not a bad idea to loosen these and let the tranny settle then tighten them back up. While there check the back of the trascase and see if it may be touching the skid plate, you may have a bad tranny mount letting the tcase sag and lay against the skid plate. This will also cause a thumping sound but not as drastic as you say.
Hope this helps

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post #3 of (permalink) Old 09-12-2000, 08:38 AM
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Re: Vibrations

On my CJ7 installed Rough Country 4" lift, got a vibration at @30 mph. Dropped transfer case @1" better but can still feel it. I have been told that the output yolk and the rear end yolk must be parallel or vibrations will set in and tear up the U-joints. I have yet to try this and also plan on dropping transfer case another 1/2" or so. But I can see my rear end is pointed slightly upwards so will have to shim it down which increases the shaft angle which seems backwards but The "AA" catalog also mentions this as a problem. Your problem sounds worse then mine but this may be something to look at.

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