A body 8 3/4 questions

Well here's an update on my 8 3/4. I got this for shipping and a couple of RC cars. :) It's an A body 4" bolt circle unit, and I didn't know till I got it home that it was a 489 case. I also didn't know it was a suregrip until I got the axles out. That's the good news. The bad news is that it hasn't had any fluid in it - maybe for a long time. It has surface rust all over the inside and it's frozen at the moment. I was going to go get a big bucket of solvent and start soaking the chunk. Sandblast the housing. Then what? This is my first time diassembling a rear of any kind. Do you think any of this will be useable?

P1020808 (Large).jpg

P1020809 (Large).jpg

P1020810 (Large).jpg

P1020811 (Large).jpg

P1020812 (Large).jpg

P1020813 (Large).jpg

P1020814 (Large).jpg

P1020815 (Large).jpg

P1020816 (Large).jpg

P1020817 (Large).jpg