I would buy the following:

2 axle seals
2 axle bearings
1 pinion seal
2 containers of gm 80w90 fluid
2 units of gm posi friction plate modifier
1 tube permatex ultra copper

The above is what you need to likely fix you up.
Once on the bench, you can determine if you need any additional parts.
You may need to dress the worn axle end with a stone, and possibly need to install a thicker, selective snap ring depending on the wear.

If you need advice, just ask. I have done a few dozen of these.