Not sure if it makes sense for me to replace the whole rear axle, or just the differential. Depends on what I can get my hands on and how much they cost, I guess.
NYC area. I can travel to pick it up.

 

I can send you a complete used diff, $100 delivered

 

How soon do you need to know if I want it? I'm busy for the next week or so and I haven't pulled mine apart yet.

 

Anytime. I'm always here

 

After pulling out the crown assembly, I noticed that one of the retaining/locating pins had sheared off. A local mechanic that I've worked with was able to replace it and confirmed that it was working correctly afterwards. I've reinstalled it but the battery is flat so I can't really test it out properly yet.
All signs point towards not needing a replacement diff though, but thanks for the offers I've received.