Same thing happend to me. Trying to show off as an amateur D1 Drifter, and ended up slamming the right rear up against a curb. If you let the diff/ring gear seperate from the pinion shaft, youre going to have to re-install everything "the right way" to avoid whining or eating up the gears.
If it's shimmed, make sure to put the proper ones back on the side they came from, and buy or rent youreself a dial indicator to get youre backlash right.
When I hit the curb I ended up bending the UCA & LCA on the right side. When you get everything back together check to see if 1 rear wheel tucks under the fender a little more than the other side, if it does, I'll bet the farm you got yourself a bent control arm.
Have fun an good luck w/ the project. Rear ends are always fun to work on on youre back
