Detroit DD13 12.8 L Ultra Low Sulfur Diesel 410 hp Engine, 2011 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Allison 4000HS Automatic Transmission, 12000 lb Front Axle, 23000 lb Rears, Meritor RS-23-160 Drive Axles, 4.30:1 Axle Ratio, 35000 lb GVWR, Air Ride Cab, 295/75R22.5, Airliner Air Ride Suspension, 165 in Wheelbase