ring gear or transfer case chain. sounds like its riding on the backside of the gear when the load is off the driveline. does it happen at any speed or only in lockup.

My u bolts are fine but yesterday when i took the plug out of my rear diff there will metal shaving on it but not much so i will pull it off today and look at it then let you guys know. thanks for the help

Well found out the problem. the pinion nut was loose and the pinion was movin around and f'd the bearing. the nut was not torqued to spec so over time it just walked off.

every bolt and nut was torqued to spec

no it wasnt. cuase that baby was loose.

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yep it was the pinion bearing but there was also one to many shims on it to. we took
.021 off. mow it runs and sounds great.

when ever you change bearings it will change the Number of shims you need/use i rebuild differentials and bevel gears where i work and i can just put new bearings and sealls in something and make a big difference in how many shims you need to add or subtract

yes i understand that. and that is why we took one of them out.

that happened to me a couple of weeks ago I torqued mine down to spec after changing the pinion seal and the nut started backing it self off after a couple of weeks of driving so I just put some red lock tite on there then torqued it back down and problem solved.

Ya i had to do that to cause the parts store didnt have a new nut. your suppose to replace it every time you take it off but locktite is the key. I also have to speedy sleeve the yoke cause it was wore pretty bad