First find out what you got.
Clean whole axle assy to find casting or part numbers.

2. Send good photos of everything here to get help on identification.

3. Buy manual "books4cars" in Seattle are one source.

4. Inspect axle differential see what may need done

5. Find parts supply - at minimum I would say wheel bearings and seals - may as well get brake parts while you are there.

Dan Bentler