JeepMN

The front one I can move a very little amount, even though I just greased it like 5 days ago. And the rear has absolutely no play. But also the vibration is at its worst in 2WD if I have the front ds in or not.

ehall

Sorry one more question. Does the vibration feel like a rumble, or a shake?

JeepMN

No need to apologize. I appreciate any help. And I would describe it as a violent shake.

ehall

Rumble is usually driveline problems, like u-joints or pinion angle. Shake is usually steering problems or tire balance.

If you don't feel a rumble from the loose slip joint then that's not the problem.

Rear sounds like driveshaft or pinion angle problem to me, even though you say its more of a shake. Did you install shims along with the SYE? With CV driveshaft, the pinion has to point at the transfer case output.

Larry's XJ

Ever. Check or change TC fluid??

JeepMN

Sorry for the delay. One quick question. So I had my rear driveshaft rebuilt and ever since then it's been very difficult to install it due to it being slightly longer than before. I am having to jack up the crossmember slightly to allow the u joint to fit into the yoke on my differential. Could this be causing the vibes possibly? And when I described my shake/vibration. I should say that it's a shake in my feet. The wheels/tires have been checked off of the list completely. I have had driveshaft problems before and it is the exact same vibration.

ehall

You should be able to compress the driveshaft enough by hand to get it into the u-joints. If you can't do that then it is very likely putting pressure on one or both yokes

JeepMN

I'm heading over to my driveline shop tomorrow to get it shortened so I will report back when I know something.