Detroit DD13 6 Cylinder 12.8 L Diesel 540 hp Engine, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 13300 lb Front Axle, 40000 lb Rears, Dana DSH40P Drive Axles, 3.70:1 Axle Ratio, 53300 lb GVWR, Air Ride Cab, 72 in Mid Roof Sleeper Cab, Aluminum Wheels, 295/75R22.5, Airliner Air Ride Suspension, 233 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks