Machine description: GMC V8 Diesel Engine, Automatic Transmission, 9000 lb Front Axle, 19000 lb Rears, 38000 lb GVWR, 10.00R20 Front Tires, 10.00R20 Rear Tires, Double Frame, Spring Suspension, 149 in Wheelbase, PTO, Rear... more info about the 1988 GMC C70.