I decided to just get a new cross shaft from Jacks and reuse the rest. They told me I shouldn't have any problem as long as I remove any sharp edges on the partially broken tooth on the ring gear.

I was looking around for a used 4-spider, but once I realized that I also needed an output shaft and transfer-case I decided to try this route... Time will tell how smart/stupid of a decision that was....

Still waiting on the part from Jacks, they've been a nightmare to deal with. Seems like customer service has gone sharply downhill there.