Cummins ISC 300 6 Cylinder 8.3 L Diesel 300 hp Engine, 2006 US EPA Label, Eaton Fuller RT-8709B 9-Speed Manual Transmission, Spicer S23-190 Drive Axles, 3.91:1 Axle Ratio, 295/75R22.5, Spring Suspension, 150 in Wheelbase