Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 455 hp Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, 12-Speed Automated Transmission, 13300 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 2.64:1 Axle Ratio, 53300 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Bunk Beds, Aluminum Wheels, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 228 in Wheelbase, Dual Fuel Tanks