Have a popping noise. Pretty easy to replicate. Just go in reverse and give it some gas. Not a lot, just enough to get me up my slightly inclined driveway. If i baby it up, I dont get the pop, only when i give it some umpf. And its very audible. About 100% sure its not drivetrain related. If I give it gas just above idle, and halfway up give it a little more, it pops. No rear sway bar, had to remove it due to longer control arms angling the links enoug that they hit the CA mount during flex. Just Been too lazy to drill out the new holes.

Rock Krawler 2.5 with 8 new arms, RK rear TB relocation, front RK TB, front RK links, extended brake lines, Teraflex lower bumpstops(4). Front/rear ebay bumpers.

Think thats it, that would matter anyways. It sounds like its coming from the rear end. And obviously I cant get out and observe it myself. Nothing is loose. The only thing I can think of is the rear bumper. The bolt holes for the sides on the bumper are elongated, so if it was loose enough you could actually tilt the bumper forward/backward. But I have that joker tightened down pretty good. Even if it was that, you woyuldnt be able to see a few millimeters of play while I give it some gas.

TL/DR: Where to start looking for popping sound while giving it throttle. Only pops once, not repeatedly. Like something is being seated.

Cheers

 

Have you looked at drive line u joints. Thinking

 

Update. Not the bumper/tire carrier shifting. I marked several locations on it and after a few tests, the lines matched up. Re-tightened all the control arms and track bar. Still there. So next question. Could the bushing on the rear TB be popping? My axle is rotated quite a bit. As you can see the bushing is warped.





Can't really get back there and see it. It only pops when under load, and not necessarily when you take off. I can idle/feather the gas as long as I want, but if I go more than half throttle, to where the jeep will rock back a little, it pops. It will only pop once going forward. I then have to put it in reverse and give a little gas to make it pop again and so on and so on. It's like something is seating, or binding/unbinding and it take a shift in momentum to cause it. I'm at a loss.

 

You don't have a limited slip or Detroit locker in the rear diff do you?

 

Yup. Everything checks out. Even had a few buddies look over it. The only fault to be found is the lip (I guess that's what it could be called) of the rear drive shaft is bent. A little grease had come out. But nothing too bad. Possible culprit? Maybe. But again, it doesn't happen just because the drive shaft is turning. Just idling and even slight braking over the bump at the end of the driveway will pop it. It only seems to pop when the axle moves in relation to the frame/body. Like I mention earlier, taking off with a little gas, the ass end sags down a little. And reversing with some gas, the ass end raises up some.

 

Factory rubi locker.

 

Used 1 time. Only 3k miles on jeep. Never beat on. Pretty sure locker wasn't needed when used. Just in case kind of thing.

 

To me it looks like the drive shaft was over flexed at some point and likely damaged the joint. When my front drive shaft was going it would give a clicking but only when under load.

Edited to add: I didn't catch the part about popping once. It couldn't hurt to disconnect that end of the shaft and just rotate the joint around by hand to feel if it is catching anywhere.

 

So I just went and measured how off center my rear axle was. I figured i'd throw on the RK TB bracket, weld it, and call it good. Turns out, its not. Sticks out just over 1/2" on the drivers side. I guess I'll try an adjustable with a JJ style end to get rid of the bind, since it'll flex. Since its pushed to the drivers side, that means its too long. Anyone know of a company that makes a rear adjustable TB that can go slightly shorter than stock?

 

I think that when the axle shifts to the side from lifting you need to lengthen the TB not shorten it to re-center.
Edit: I think the relocation bracket only moves roll center back where it needs to be (corrects geometry) I don't think (probably wrong) that it re-centers...
Edit2: after refreshing my memory (had to slide under to see which side connects to axle) yes, if it sticks out drivers side TB is too long