So went to the Hobby shop and put it on a lift. Took me a little while to get the cover off. I didn't notice anything broken, but what do I know about differentials?? lol

I had the head mechanic come by and there's a few wear marks he said but no chips and or burn marks he said the fluid was probably just past it's prime. So I put it all back together and filled it up with RP 75w-140 and no more noise!! The car feels so much smoother now, I never noticed how bad it was before!