Machine description: 6HK1 6 Cylinder 7.8 L Ultra Low Sulfur Diesel Engine, Automatic Transmission, 10000 lb Front Axle, 19000 lb Rears, 25950 lb GVWR, 295/75R22.5, Spring Suspension, 206 in Wheelbase, 140 in Cab to Axle, ... more info about the 2009 GMC C7500.