Okay, I'm planning the first phase of my '75 K5 build up. Starting with the drivetrain. Here's what's in it now: a dead small-block (munched piston), a rebuilt TH 350 (only 13k miles on it), and the stock T-case. I have a 454 waiting for it, and had planned on mating it to a 700 R4, because of the OD (lots of freeway driving), but I'm having concerns about it handling the big block. My friend is offering me a high end TH 400, cheap, but it's for a 2WD truck. My ideal set-up would be the 454, with a 700 R4, and a PART TIME transfer case. Starting with the 454, what would be the ultimate, bullet-proof drivetrain? How strong is a 700 R4? Is there a significant gain from the OD? How compatible are these trannys (350, 400, 700)? What about the T-case? Pleeese, what do you all think?