Making 860 lb-ft of torque at 1,300 rpm and 300 hp at 2,200 rpm, from 7.6L (466ci) with six inline cylinders, the MaxxForce DT466E is Navistar’s most recent and most powerful generation in a 1950s-era design that debuted high in the engine of a farm tractor and eventually found its way into a truck — and boy, has it ever made a lot of people make a living.