Turning the sound goes away? That doesn't sound like a Drive shaft U joint to me... still might be possible that it is a front axle u joint perhaps. One suggestion if you can do it... put the whole jeep up on jack stands and put it in gear and walk around to see if you can hear where the sound is comming from.
I had this issue once, but it would go away when turning in one direction, but get louder turning the other direction and the noise was comming from the rear. Turned out it was a threaded lug bolt that had come loose on one of the rear axle shafts (alloy). So it was sticking out a hair too far and was clicking against an internal E-Brake part making the sound.
I had this issue once, but it would go away when turning in one direction, but get louder turning the other direction and the noise was comming from the rear. Turned out it was a threaded lug bolt that had come loose on one of the rear axle shafts (alloy). So it was sticking out a hair too far and was clicking against an internal E-Brake part making the sound.