The truck has a clunking noise coming from the rear end. I'm not exactley sure what the problem is so i figured i would get some different opinions. The noise doesn't start right when i start driving it will start after driving for roughly 5 min. There also seems to be alot of slack in the gears when u twist the drive line back and forth it clanges. The trucks a 85 4x4 thats welded in the rear any help would be greatly appreciated.

 

if its twists alot its backlash from being worn and the noise could be srapnel from the rear being welded and something has broken off need to check befor bad stuff

 

I've already pulled the 3rd. member and there was no srapnel. But when i pulled the axles there seemed to be a little bluing of the steel on the bearing. But everything seems to be tight in the 3rd as far as bearings seem but what about a crush sleeve what are the noises from this.