Machine description: Cat 3406B 6 Cylinder Diesel 350 hp Engine, Engine Brake, Eaton Fuller 15-Speed Manual Transmission, 18777 kg Front Axle, 45000 lb Rears, 28929 kg GVWR, 315/80R22.5 Front Tires, 11R22.5 Rear Tires, Hen... more info about the 1990 Western Star 4800.