Cummins ISB 6 Cylinder 6.7 L Diesel 325 hp Engine, 2015 US EPA Label, Requires Diesel Exhaust Fluid, Cruise Control, Allison Automatic Transmission, 12000 lb Front Axle, 20000 lb Rears, 32000 lb GVWR, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Air Ride Suspension, 154 in Wheelbase