Cummins 6 Cylinder 5.9 L Diesel 260 hp Engine, Eaton Fuller 9-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, 11R22.5, Rubber over Walking Beam Suspension, 250 in Wheelbase, 187 in Cab to Axle, 232 in Cab to End of Frame