Vibration Problem

[SUB-ZERO]

My buddy has a 87 Jimmy.We recently installed a 4" suspension lift and 35" BFG's.It seemed to have a slight driveshaft binding but barely noticeable.Just recently(about a month after the lift)we installed a 4 degree shim in the rear. The pinion angle looks good but now it has very noticeable vibration.Help!

 

[gone huntin]

What are the angles now? Is the driveshaft solid between the joints or does it have slip yoke between them?

 

[loafer]

My buddy has a 87 Jimmy.We recently installed a 4" suspension lift and 35" BFG's.It seemed to have a slight driveshaft binding but barely noticeable.Just recently(about a month after the lift)we installed a 4 degree shim in the rear. The pinion angle looks good but now it has very noticeable vibration.Help!

You need to lower your t-case or get a cv driveshaft. The u-joint angle at the t-case is too high. There are many posts on this issue.