Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel 435 hp Engine, 2011 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Eaton Fuller FRO-15210C 10-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, Dana DS404 Drive Axles, 3.70:1 Axle Ratio, 53000 lb GVWR, Air Ride Cab, 275/80R22.5, Airliner Air Ride Suspension, 175 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks