Cummins ISL9 6 Cylinder 8.9 L Ultra Low Sulfur Diesel 300 hp Engine, 2014 US EPA Label, Requires Diesel Exhaust Fluid, 8584 Engine hrs, Allison 3000 Automatic Transmission, 12000 lb Front Axle, 23000 lb Rears, Detroit DA-RS-23.0-4 Drive Axles, 4.78:1 Axle Ratio, 35000 lb GVWR, Air Ride Cab, Aluminum Wheels, 11R22.5, Airliner Air Ride Suspension, 158 in Wheelbase, Dual Fuel Tanks