Paccar 6 Cylinder Ultra Low Sulfur Diesel Engine, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Automated Transmission, 12350 lb Front Axle, 38000 lb Rears, 50350 lb GVWR, Air Ride Cab, Aluminum Wheels, 295/75R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Air Ride Suspension, 178 in Wheelbase, Dual Fuel Tanks