1972 nova

I have a '72 nova- I need to know what the original rear-end was? Also how to rebuild a 10 bolt rear-end!

it is a 8.5 ten bolt. with 3.08s or 2.73s. If it is a 4 speed could have 3.42s

If its the automatic it is going to be an 8.5 inch with 3.08s.