Machine description: Mack MP8 6 Cylinder 12.8 L Diesel 505 hp Engine, 2011 US EPA Label, Eaton Fuller 18-Speed Manual Transmission, 20000 lb Front Axle, 44000 lb Rears, 64000 lb GVWR, Aluminum Wheels, 425/65R22.5 Front Ti... more info about the 2012 Mack GU813.