High Angle Driveline has the solution. The main problem is the operating angle of the shaft. Ideally you want the two ends of a drive shaft to be within a few degrees of each other for maximum u-joint life and minimum vibration. If the angles aren t correct, you will experience vibration. Anytime you add a lift, you risk the chance of the angles be out of wack.
Larger lifts are worse of coarse.
The more angle you have on a shaft, the more likely you will have this problem. We tried to correct this problem by installing shims on the transfer case to angle it down and using shims on our rear axle to match the transfer case. Unfortunately, this solution didn't work. Adding more angle also decreases your u-joint life. Basically a typical u-joint will last 5000 hrs.