I tried searching and read many threads on driveline clunk but haven't found what I'm looking for.

My 91 makes a clunk towards the rear after coasting and getting on the gas hard. If I ease into the gas it doesn't do it. It doesn't clunk from park to reverse or drive like many describe in the other threads either.

I'm hoping somebody has had the exact problem and fixed it before I start throwing parts at it.

 

The only way you're gonna find what you're looking for is to GO LOOK!

Under the Jeep that is. Around these parts, we call it "noggin pokin".

That's where you use your God given senses to inspect under YOUR Jeep for stuff that might be loose in the drivetrain.

There's no Silver Bullet cure you're gonna find from a keyboard, mouse and monitor.

And, if you feel you don't have the skills to "noggin poke" then find a shop, friend, or relative who does.

 

I guess I should have stated it but I have been under it looked at the usual suspects for noise and everything looked ok. I'm new to the forum but not new to working on my vehicles.

 

both of my xj's do the same thing. both also sometimes make the clunk if i'm accelerating and just let off the gas (opposed to gently letting off). i've also inspected underneath and didn't notice anything out of the ordinary. i'll probably get a lot of crap for this but my 95 has been like this since i got it 5 years ago and it hasn't gotten any worse.

i plan to start checking joints soon once i learn how to

 

My 99 dose the same thing and it's more pronounced while in 4wd. I can't find any thing loose neither could 2 different shops.

 

Before suspecting the transfer case or trans, check the straps on the leaf springs, located in front of the rear tires. If these are broken or missing, they slap around and "clunk" when accelerating or decelerating.

 

Mine started this clunk the other day after a long wheeling trip. The leaf springs are new but I'll get under there tonight and look to see if im missing anything.

 

Always a good idea to re-torque after spring installation.

 

One more thing to look at might be your front drive shaft, if it's loose at the slip joint it could make some noise.

 

I got under it again and looked close at everything and found a bad u joint in the rear driveshift. When I first looked and wiggled it, it didn't move at all. When I looked closer at it one of the caps was broken and all the needle bearings were gone. Lesson learned. All the clunking is gone now.

 

Persistent noggin pokin at it's best. First time you checked did you have it in gear or Park with the park brake on?