I got a 2000 xj with a 3 inch lift with a t-case drop and I can't fix this vibration I have changed all the u-joints front hubs front drive shaft was even replaced tires have been balanced a few times nothing seems to fix it for long maybe a week or two then it's back any ides?

 

check the track bar bushing. Thats what mine was doing just before the dreaded death wobble ensued. good luck

 

so is it coming from the front or rear?

if its coming from the rear, i would say check your pinion angle. your rear end may need shims to fix your pinion angle.

 

I have no idea to tell you the truth

 

i would suspect that is it with the things you have done already.

your pinion needs to be at the same angle as your t-case output shaft if you do not have a sye. in theory this makes the angles cancel eachother out and you should have no vibrations. if you do use shims to correct this, use metal shims and not alum ones. they just break.


when you do have a sye, the pinion needs to be pointed at the t-case.

 

So how do you shim the rear

 

with axle shims

 

I re read your post and it makes sence now I'll check it out today