460 and 400 trannys are similar, no other ones fit. When it comes to Fords, I tell people, always get the trans and ring gear with the engine. From bitter experience, "Parts from a red one won't fit a blue one!!" Never had much luck with adapters, either. The ring gear balance weights change every month or so of manufacture, so be sure to take yours with the engine when you balance it. The internals should fit any pattern C-6 case. Be sure what you're buying, there are lots of different ones.