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All of them. By that I mean: The "Big Cam" Cummins engines were the dominant player in OTR trucking for many years until being unseated by the Detroit 11 and 12 liter engines. Just about every transmission appropriate for that hp and torque will fit, with the correct bellhousing, flywheel and...

M915A1 is Big Cam III Cummins, 400 hp. No lockers in the Eaton rears. Already has extra air tanks and dual air system. Parts are at your local heavy duty truck supplier (Napa, et al). Will pull the crap outta civi and mil trailers. Seems to be reasonably reliable. Do a forum search for...