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You might be able to squeeze 8 mpg out of a M11 with the right OD ratio. These trucks do not have good gearing or any aerodynamics. My vote would be a mechanical M11 & 13 speed trans. They are 500 pounds lighter than an N14, much cheaper and can still put out plenty of power to move your 934...

Ive never heard of anyone swapping in a 60 series. Probably because its computer controlled and no one wants to deal with that. Big OTR motors have been put in 5 tons. Some guys have made the rest of the drive train last, some guys have blown up trans and transfer cases. It depends on your...