Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 455 hp Engine, 2016 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Detroit DT12-OA 12-Speed Automated Transmission, 13300 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 3.08:1 Axle Ratio, 53300 lb GVWR, Air Ride Cab, 60 in Mid Roof Sleeper Cab, no data Sleeper Air Conditioner, Auxiliary Power Unit, Aluminum Wheels, 295/75R22.5 Front Tires, 275/80R22.5 Rear Tires, 4-Bag Air Ride Suspension, 216 in Wheelbase, Air Sliding 5th Wheel, Headache Rack