Detroit DD13 6 Cylinder 12.8 L Ultra Low Sulfur Diesel 410 hp Engine, 2014 US EPA Label, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Allison 4000 Automatic Transmission, 12000 lb Front Axle, 23000 lb Rears, Meritor RS-23-160 Drive Axles, 4.30:1 Axle Ratio, 34700 lb GVWR, Air Ride Cab, 275/80R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 162 in Wheelbase