Detroit DD13 6 Cylinder 12.8 L Diesel Engine, 2013 US EPA Label, Eaton Fuller FRO-16210C 10-Speed Manual Transmission, 18000 lb Front Axle, 400 lb Rears, Meritor MT-40-14X Drive Axles, 3.90:1 Axle Ratio, 275/80R22.5, Airliner Air Ride Suspension, 286 in Wheelbase, 28 ft x 96 in Bed