hey I gotta go with ARod on this one. GM's 700 Tranny is the way to go, and I would try looking at(and i'm gonna get killed for saying this probably) Summit Racing Catalogs, they keep them in stock, they're reasonably priced, and unless you order on saturday, they are shipped out the next day. Plus if anything is wrong with it, when you get it, they'll take it back and replace it, FREE(minus S/H of course). I've orders countless $'s of parts and materials from Summit, and I've never been disappointed once. Also try Scroggins-Dickey. They're pretty good too.

www.summitracing.com summit racing

www.sdpc2000.com scroggins dickey

Good luck