Caterpillar is the best engine, I would rather have one that a cumming. Cat has more power by far and is a better running engine. I have a cat V8 in a 1953 F-800, its straight piped and can pull a D4D and its 24,000lbs payload around like its not even there. I will always but Ford, Chevys Duramax is a piece of shit that likes to warp heads, and Cummins is little better but dont even compare to the power a Ford has. I have built lots of High Performanced motor for all sorts of trucks. And Ford has got the power and alot of the time they have the wrong gear ratio for what kind of things you pull. The 6.0 should have a 4:10 gear ratio for pulling heavy shit like Dodges and Chevys when they go to hell. But personally I have had the 7.3 and the 6.0 for our farm and hell they do what they are made for. Its like a grain truck the Ford 391 is a kitten compared to the Ford 475 truck motors. And alot of the people in here just come here to type shit about crap they dont understand, like a 350 has more power that a Ford 300ci 6cyl, NO SHIT a 350 is a small block V8.