Join Date: Sep 1999
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Re: lift problem
Put all the lift parts on hand tight and line it all up Before you tighen it down, if there is a stock track bar or sway bar, get rid of it.
Put on some shorter shackles(IMO, 4" max) and see If the vib goes away.
(It will handle better also)
If not, buy an angle finder and check the rear axle pinion angle compared to the Tcase output angle, they need to be very close to the same. If they are not, you need to shim or cut and reweld the axle's spring perchs so get the pinion angle is 2 degree less(down) then the Tcase output angle. You want the pinion angle a little less to compensate for spring wrap.
The Tcase drop is a last resort deal, it just defeats part of the reason of a lift, ground clearance. If the angles are right and the lift is less then 4" you can fix it, with a 4"+ lift you may need a CV shaft.