Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel Engine, 2011 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, 22700 lb Rears, 34700 lb GVWR, Air Ride Cab, 11R22.5 Front Tires, 11R22.5 Rear Tires, Airliner Air Ride Suspension, 166 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks