Paccar MX-13 6 Cylinder Ultra Low Sulfur Diesel Engine, 2018 US EPA Label, Requires Diesel Exhaust Fluid, Engine Brake, Paccar PO-16F112 Automated Transmission, 12350 lb Front Axle, 40000 lb Rears, Paccar Drive Axles, 2.79:1 Axle Ratio, 50350 lb GVWR, Aluminum Wheels, 295/75R22.5 Front Tires, 445/50R22.5 Super Singles Rear Tires, Air Ride Suspension, 184 in Wheelbase, Air Sliding 5th Wheel