Well, the rear is out. Not as much damage as I thought. Ring and Pinion seem ok, even spider gears not too bad (a little worn) but I did find some metal shards on the ends of the Yukon axles and in the case housing.. not many but a few...
So not really sure what I did to it now. Any ideas... I will pull it apart tonight but expected much worse. Tranny sounded like it was turning the drive shaft but car not wanting to move and growling when rpms applied after the bang.
Pulling trans now.
I will just rebuild a solid 489 center with good gears and put it back together... oh and go through the trans again :-D.
I really appreciate the replies as it is giving me confidence to go forward with what I have! Less bucks too!!