I have a family member that owns an 82' Dodge Ram 4x4 with a 318 2bbl. It has been lifted 2" and has 31's. Recently another family member borrowed it from the house (a young family member) and brought it back a mess. For some reason every now and then the rear end locks up completly. The back tires will slide about a foot then start turning again. This is all while off the brakes and clutch. It has an 4-speed manual, and the clutch seems ok. Does anyone know what might have went wrong? I haven't worked on rear-ends much.