Detroit DD15 6 Cylinder Diesel 455 hp Engine, Air Conditioner, Cruise Control, Power Windows, Eaton Fuller FAOM-15810C 10-Speed Manual Transmission, 12000 lb Front Axle, 20000 lb Rears, Meritor MT-40-14X Drive Axles, 3.36:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Bunk Heater, Aluminum Wheels, 275/80R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Airliner 4-Bag Air Ride Suspension, 232 in Wheelbase