Cummins X15 6 Cylinder 15 L Diesel 450 hp Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller FO-18E313A 13-Speed Automated Transmission, 13220 lb Front Axle, 46000 lb Rears, Meritor RT-46-160P Drive Axles, 3.91:1 Axle Ratio, 59220.0 lb GVWR, Air Ride Cab, Aluminum Wheels, 11R22.5 Front Tires, 11R22.5 Rear Tires, Airliner Air Ride Suspension, 195 in Wheelbase, Air Sliding 5th Wheel, Blower, Dual Fuel Tanks