Not much to "rebuilding". I assume you're going with some kind of shift kit. I like Superior Products. They still sell Fairbanks kits. Any of the brand's kits come with good deestruckshuns so you'll be fine.
I'd figured it would be more than that, since the lockup in the car is slipping in reverse and the spare 904 was inoperable when I took it out. I was told that bands were burned out (or something).