Cat 3406E 6 Cylinder Diesel 450 hp Engine, Engine Brake, Eaton Fuller 18-Speed Manual Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, 3.70:1 Axle Ratio, 52000 lb GVWR, Aluminum Front Wheels, 11R22.5 Front Tires, 275/80R22.5 Rear Tires, 8-Bag Air Ride Suspension, 176 in Wheelbase, PTO, Wet Kit, Hydraulic System, Air Sliding 5th Wheel, Dual Fuel Tanks