The guy that towed my rig to Moab a couple of weeks ago drives a 94 Dodge diesel and he mentioned that Cummins is actually owned by Ford but can't be used in the F150, F-250 or F350 due to contractual obligations. He said you can get an F450 with a Cummins and I think he said you can even get a Cumnins with a Allison transmisison out of the Chevy's. I have not looked this up to confirm, but it sure sounded interesting.
