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Yep. They can build one that will handle that in the weight range you plan on.

I'd check with Allison about a custom pump.

I have access to all that and then some and I would not do a custom engine. You're a better man than I am. There's a few folks on LS1tech that welded two blocks together to make a V12. It's a boatload of work.

Depends on your bell housing, I guess. Allisons are proven, with support everywhere. I know both those guys and they do well, but if something were to go wrong, you can go to any Allison dealer. There are bound to be 300X more Allison transmissions out there in the world operating at those...

Id look at the Allison HD9600 and a chain drive for your transfer case... and Ovuerson for your axles shafts. http://www.allisontransmission.com/docs/default-source/specification-sheets/intohs_9600_mar13.pdf?sfvrsn=2 They're 6 speed.

Cool, build me one, too. How much weight can you handle for your transmission?

Allison HD series, all day long. I have a 680hp, 2570 ft lb motor in front of a soon to be modified HD4060 in a 21,000lb truck that will never tow heavy again. It's rated from the factory for 600hp and 2100ft lbs of torque moving 91,000lbs. BTW, if you're over 1K HP, your torque will be more...