6 Cylinder 8.3 L Diesel Engine, Engine Brake, Eaton Fuller FRO11210C 10-Speed Manual Transmission, Differential Lock, 20000 lb Front Axle, 40000 lb Rears, Spicer DSP41 Drive Axles, 4.33:1 Axle Ratio, 60000 lb GVWR, 315/80R22.5 Front Tires, 11R22.5 Rear Tires, Dual Steering Boxes, Double Frame, Air Trac Air Ride Suspension, 220 in Wheelbase, 156 in Cab to Axle, 224 in Cab to End of Frame, Hour Meter Reads CNV