Cummins ISX15 6 Cylinder 15.0 L Ultra Low Sulfur Diesel 450 hp Engine, 2013 US EPA Label, Requires Diesel Exhaust Fluid, 13766 Engine hrs, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 12350 lb Front Axle, 40000 lb Rears, 52350 lb GVWR, Air Ride Cab, 295/75R22.5, Air Ride Suspension, 175 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks