Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel 450 hp Engine, 2012 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller FRW-15210B 10-Speed Manual Transmission, 13300 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 2.64:1 Axle Ratio, 53300 lb GVWR, Air Ride Cab, 72 in Mid Roof Sleeper Cab, Aluminum Outer Wheels, 11R22.5, Airliner Air Ride Suspension, 234 in Wheelbase, PTO, Air Sliding 5th Wheel, Dual Fuel Tanks