Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 455 hp Engine, 2021 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Detroit DT12-V 12-Speed Automatic Transmission, 12350 lb Front Axle, 40000 lb Rears, Dana DA-RT40.0-4S Drive Axles, 2.64:1 Axle Ratio, 52350.0 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Bunk Beds, Aluminum Wheels, 295/75R22.5 Front Tires, 295/80R22.5 Rear Tires, Airliner Air Ride Suspension, 221 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks