Detroit DD13 12.8 L Ultra Low Sulfur Diesel 450 hp Engine, Air Conditioner, Cruise Control, Power Windows, Digital Mirrors, Engine Brake, Eaton Fuller FRO-15210C 10-Speed Manual Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Spicer DS463P Drive Axles, 3.70:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 11R22.5 Front Tires, 11R22.5 Rear Tires, Airliner Air Ride Suspension, 178 in Wheelbase, Air Sliding 5th Wheel, Headache Rack, Dual Fuel Tanks