Thanks for looking.... I was also looking at the AOD, C6, and the T-18. I found all the automatics and manauls at various websites as well as here, but can't find much of anything on the TREMEC 3 speeds.

Mostly I'm thinking about the spare trannys / axles I have and maybe swapping. I have a couple ideas but still trying to evaluate engine, tranny, and rearends so I end up with the right mix of power and economy in each truck.