Detroit DD13 6 Cylinder 12.8 L Diesel 450 hp Engine, Requires Diesel Exhaust Fluid, Engine Brake, Eaton Fuller FRO-15210B 10-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 3.73:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, Aluminum Wheels, 255/70R22.5, Airliner Air Ride Suspension, 180 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks