Detroit DD13 6 Cylinder 12.8 L Diesel 525 hp Engine, 2017 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Automated Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 275/80R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 178 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks