Paccar MX 6 Cylinder 12.9 L Ultra Low Sulfur Diesel 485 hp Engine, 2012 US EPA Label, Engine Brake, Eaton Fuller RTLO-16913A 13-Speed Manual Transmission, Double Differential Locks, 13200 lb Front Axle, 38000 lb Rears, 3.42:1 Axle Ratio, 51200.0 lb GVWR, Air Ride Cab, 72 in High Rise Sleeper Cab, Bunk Beds, Aluminum Front Wheels, 11R22.5 Front Tires, 11R24.5 Rear Tires, Air Ride Suspension, Air Sliding 5th Wheel, Headache Rack