Yesterday I was getting my Jeep dirty and put myself in a position where I had to reverse rapidly. After about 6 feet, there was a bang, and it popped out of gear. Now, when I shift into R , it goes into gear fine, but a second after I start to move there's a grind and it pops out again. All 5 forward gears work perfectly though. Is this something I can fix? I am pretty capable DIYer. Is it the Tran at all? Or could it be the Diff?