Teal96XJ

Ok i have been noticing when driving this clunk that comes from (i think) the rearend or somewhere around there it only makes this noise as im shifting gears a buddy of mine said it could be the U-joint coming out of the rearend thats making that noise and that i should change it anybody else have this problem?!?!!

Thanks in advance......

BuckB91XJ

Could also be:

1.) Broken degree shim between the leaf spring and spring perch like I had.
2.) Loose shock or worn shock bushing.
3.) Warn out rear driveshaft U-joints.
4.) Warn bushing in the rear suspension.
5.) Warn rear differential gears.

Check those out. Bet you find your problem among them. If you don't. post up and I brainstorm somemore.

Teal96XJ

Im probably goin to go with the # 3) lol ill try that 1st maybe this week.....

Is there anyway to test that theory rather then just buying and trying lol......

BuckB91XJ

I hope you're right, Bud. It's about the easiest and least expensive to fix.

Teal96XJ

Thats why i'd try and do that 1st before anything else lol.......

MasterShakeXJ

check the ds for play to see if the ujoints are bad. you could always try greasing it to see if that helps, sometimes it will revive ujoints.

Teal96XJ

Ok ill try that now and check it out thanks alot guys.......

Teal96XJ

Update: Ok so i checked to see if there was any driveshaft play and as i moved the driveshaft i found out that the back (closest u joint to the rear end) is bad and actually all messed up.....I also noticed when i moved the driveshaft back and fourth in a quik motion i noticed the noise that i could hear from the cab when shifting gears....So heres a new question how hard are they to replace it doesnt look like to much work to do.....

BuckB91XJ

U-joints are easy, if you don't have one of those fancy presses, you can do it with a bench vice and correct sized sockets or a BFH and correct sized sockets. I prefer the bench vice method myself. Only did the BFH method when I had to do it on the trail once.

Teal96XJ

Yea one on the little caps that hold the bearing's i beleive is flopping all over that u joint so i need to do it before i go on my trip to Naples (3 hour drive)......

Also would bad driveshaft u-joints create some vibration's?!?!?!

BuckB91XJ

I had a rear U-joint let go while I was crawling along on a trail run one time. I would never want to see the results of that happening while tooling along at 85 on the freeway.