Machine description: Navistar V8 7.3 L Diesel Engine, 1990 US EPA Label, Automatic Transmission, 6000 lb Front Axle, 15500 lb Rears, 21500.0 lb GVWR, 295/75R22.5 Front Tires, 9R22.5 Rear Tires, Spring Suspension, 170 in W... more info about the 1990 International 4600.