Detroit DD15 6 Cylinder 14.8 L Ultra Low Sulfur Diesel 455 hp Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller FRO-16210C 10-Speed Manual Transmission, 12500 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 3.42:1 Axle Ratio, 53587 lb GVWR, Air Ride Cab, 60 in Mid Roof Sleeper Cab, Aluminum Wheels, 295/75R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Air Ride Suspension, 240 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks