Cummins ISX15 6 Cylinder 15.0 L Ultra Low Sulfur Diesel 450 hp Engine, 2014 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 12350 lb Front Axle, 40000 lb Rears, 52350.0 lb GVWR, Air Ride Cab, 73 in Mid Roof Sleeper Cab, 295/75R22.5, Air Ride Suspension, 228 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks