I had my CJ5 lifted using spring over axle method.

Question

upon road test I noticed that my jeep is vibrating especially at high speed followed by a clinging noise coming from the rear propeller what could possibly cause it? what is the possible intervention to fix this problem?

Answer 1

I would say the pinion angle is a little to steep. The only way to fix it is to cut the spring perches off of the axles, rotate the axle, and re-weld the perchs back oon to the axle.

Answer 2

You are dealing with the shortest wheel based Jeep released to the public. With that much lift, check the pinion angle. The pinion (nose of the differential) should point at the output shaft (rear) of the transmission. If not, the pinion angle needs to be corrected or you will trash the u-joints. The clinging noise your hearing is probably the u-joint halves slapping themselves. There are several ways to correct the pinion angle. They make wedge shims in different degrees for the spring perches or cut and re-weld the spring perches or install a Slip Yoke Eliminator (SYE).

Happy Trails!

Answer 3

I would agree perhaps your pinion angle is a bit steep and but it could also be axle wrap which is common with spring over axle suspensions especially behind a V8.  I would be its the pinion angle though. The U-Joints are probably not at the correct angle causing the vibration and at such an extreme angle causing the noise.