Machine description: 5 Cylinder Diesel Engine, Allison Automatic Transmission, 14600 lb Front Axle, 45000 lb Rears, 59600.0 lb GVWR, 12R22.5 Front Tires, 12R22.5 Rear Tires, Spring over Walking Beam Suspension, 224 in Whe... more info about the 2007 GMC C8500.