Machine description: Cat C7 6 Cylinder 7.2 L Diesel 300 hp Engine, 2005 US EPA Label, Eaton Fuller 8LL Manual Transmission, 16000 lb Front Axle, 45000 lb Rears, 61000 lb GVWR, 315/80R22.5 Front Tires, 11R22.5 Rear Tires, ... more info about the 2006 GMC C8500.