Rcool

I drive a 1999 mostly stock XJ with a 2 inch lift. I have never had any issues with drive train vibration until greased my slip yoke. It was a quick easy job and I didn't have any issues. Everything seems to be put back exactly as it was before the job. However, I have pretty noticable vibration on acceleration now that immediately goes away once I let off the gas. What could be the problem here?

tech

Are you talking about the slip yoke in the trans ? and did you make sure the the rear u joint is seated .

That Jeep Guy XJMJ

perhaps a more thorough description of what all you did? Are we talking you literally just unbolted the straps at the axle's yoke then pulled the slip shaft free from the t-case and greased/lubricated then re-installed?

Making sure 1: both the ujoint tabs are still present and good on the yoke, 2: like mentioned above, the ujoint caps are properly seated in the yoke itself as well and the strap bolts are tight.

Rcool

"Are we talking you literally just unbolted the straps at the axle's yoke then pulled the slip shaft free from the t-case and greased/lubricated then re-installed?"

Yep, that's exactly what I did, nothing else. I'll double check what you suggested and go from there.

Rcool

SOLVED: I had a bad U-joint.

The U-joint between the rear differential and the driveshaft was bad. I didn't initially think that was the issue because it didn't have any give after reassembling everything after the slip yoke lubrication was done.

However, today when I gave the rear driveshaft a shake there was a ton of movement. I replaced the loose U-joint and the vibration I was having while driving completely disappeared.

IJM

I love a happy ending.