Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel 380 hp Engine, 2012 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 3.23:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 295/75R22.5, Air Ride Suspension, 172 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks