So I took my Jeep to a mechanic to diagnose for sure whether I need a fuel pump or not. While I was there I had him take a look at the clunk I get whenever I put my XJ into drive or reverse. I thought it was just my U-joints but he told me my transfer case was going bad. The thing I'm confused about is why or how would the transfer case be doing anything when Im in normal *** 2 wheel drive? He told me the chain inside the transfer case could be stretched, which makes sense.

Is this guys trying to screw me or is this plausible?

 

If the chain was streched that bad, you would here it make a ton of noise when under load on 4wd low. There are a few things that could make that sound, many of which not as bad as needing a tcase. If you can get somebody in the jeep to shift it back and forth while you look for the sound. Just try not to get under it, lol.

 

Mine does the same thing but it makes no noise is 4lo I use that a lot!

 

mine does that too so i changed the u joints and decided i didnt car and hasnt got any worse

 

Ya it doesn't bother me either but I would fix it if I knew what it was

 

Could be u-joints,motor or trans mount.I would check those out first.
U-joints are easy to diagnose,just get under the truck and try turning the drive shaft to see if there is any play.
Motor mounts you can have somebody shift through the gears with the truck running (foot on the brake) and watch for excess play at the mounts,you can also try prying on the mounts a bit with the engine off to see how much play there is.
Also I am not too familiar with the mounting of the transfer case but check the mounts for that as well.

I am not saying the all shops or mechanics are crooked but they need to make money and people who put full trust in them are the easiest to scam. With the economy the way it is it really brings the worst out in some people.
Check the easy,cheap stuff first.You can always get a second opinion too if you dont feel you can diagnose the issue your self.

 

There are a couple of threads about greasing the splines at the yoke. I'd try that if it's not your u joints.

 

If anyone finds anything out post it here!

 

2X Read This: http://www.jeepforum.com/forum/f11/g...ite-up-357569/

 

Mine used to thump everytime I shifted in and out of gear. This fixed it.

https://www.cherokeeforum.com/f2/free-quick-fix-41821/

Your problem might not be just a cable, but it wont hurt to try

 

mdc- thanks for the info, Im gonna do this when I get a chance but I dont think this is my problem. I really only have trouble going from park to drive, park to reverse, drive to reverse etc. It doesnt give me any grief when in motion that I know of.

 

what kind of noise? I cant fully recall but it might have made excess noise last time I had it in 4L. What noises should I be looking for?

 

Clunk when you shift from park or from D to R could also be to much backlash (ring and pinion) or worn U joints

 

Any way to service the ring and pinion shy of replacing the whole assembly? How could I check for this?

 

For real? 2 brilliant people (ok, 1 1/2, I'm only half brilliant) suggested you lube your slip joint. It's very common for a dry slip joint to make a clunk noise under the conditions you describe.