Hey guys i need HELP BAD!! I have a dodge 2500 2000 at a crawl i get a clunking noise? I all ready checked the ujoints by prying on them with a flat bar thay don't move and when i put air in my tires 80 psi. The noise is not so bad. Also when i put it in drive and back to reverse the drive shaft spins a good ways with a crazy noise.is my rear end going out? Please help

 

Time to pull the cover, and have a look at what's going on in there.