I drove her into the shop to put the rear spacers back on and put her on my lift. When done I dropped her down and went to back other and WAM! I was only crawling but still it was sudden. I pushed her ahead and rocked it to find something stopping the rear axles so I lifted it again and spun the tires and pretty much decided the rear 1differential was the problem. I then went ahead and removed it and drained it to find some chunks of metal. I pulled the cover off and found that a set screw loose that holds the rod in the pictures. The rod was banging against the case! Had this happened Saturday on my 45 mile trip to Cabella's it would have self Destructed! I am cleaning everything well and have ordered new seals from Beaver Off Road as long as it is down.the set screw is now solid and Red Locktite was used.