Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 505 hp Engine, 2016 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller 13-Speed Manual Transmission, Differential Lock, 13220 lb Front Axle, 20000 lb Rears, Meritor Drive Axles, 3.42:1 Axle Ratio, 53220 lb GVWR, Air Ride Cab, 72 in High Rise Sleeper Cab, Bunk Beds, Aluminum Wheels, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Air Ride Suspension, 228 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks