Tell them that you want any and every old part that was replaced in the tranny, busted or not. (Old bushings/ gasket peices/ parts. everything!!! Then they dont come up with a gasket, ask them for proof that they replaced a gasket/ bushing, etc......
The tranny shops around here a f-ing thieves!!!!!
They charge you triple, to do half ass work that is only warrantied for 30 days. Hell I could rebuild a tranny and it last for 30 days, and I have never torn one apart
Zig