UglyRed

Bought an 01' xj a few weeks ago, and noticed vibration at 45 mph and above around the center of the vehicle. The front DS looked like it had the original u-joints, so I dropped it and changed all the joints. This did nothing for the problem.

The guy I bought it from had a 4" lift on it for a couple months, but removed it an put it back to stock height. Well...... after finding alot of info here, I crawled back under and found out it has an SYE and a rear DS that looks kinda like the front one. It also looks like it has a crossmember that drops down, possibly added to eleminate vibration with the 4" lift.

So, my question is, would these modifications do the opposite of what they were intended for when the jeep was lowered back to stock, and cause the vibration?

Tires balanced
front u-joints changed
diff fluids topped off
rear u-joints in good condition with no play at all
New shocks all around

UglyRed
Texas

tannerp89

the only way it could cause the issue is if the CV driveshaft is too long pushing on the rear diff causing the pinion angle to change. you can check pinion angle roughly by seeing if transfer case SYE and rear diff sit at parallel angles to each other in relation to the driveshaft...heres a link that explains it better to help ya out
http://images.google.com/imgres?imgu...26tbs%3Disch:1

UglyRed

Great, thanks. That'll get me going in the right direction.