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Tom builds the 3053 transmissions and knows them inside out, up side down, and backward. I'll default to he knowledge in this thread(sounds like you'll be ok):
http://www.steelsoldiers.com/showthread.php?128990-Real-world-SPICER-limitations
If building a "warmed over" Cummins, you might look into a 5ton trans. Might even look into an OTR cabin instead of a crew cab mod. It takes a lot to join 2 cabs and have it turn out nice(we even did one "back to back"). Not everyone defers to me, I've just had a hand in a lot of different...
If it HAS to have a crew cab and HAS to pull a gooseneck, buy a crew cab, flat bed, diesel 3500 drw truck.
Right now your building a custom truck thats going to be slow on the road and tough to make it do what you want it to do. and have about the same amount of money in it, with no re-sale value.