Cummins ISX15 15 L Ultra Low Sulfur Diesel 450 hp Engine, 2013 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller Manual Transmission, Differential Lock, 13200 lb Front Axle, 38000 lb Rears, 51200 lb GVWR, Air Ride Cab, 72 in Mid Roof Sleeper Cab, Aluminum Wheels, 285/75R24.5, Air Ride Suspension, 245 in Wheelbase, Dual Fuel Tanks