Cummins B5.9 6 Cylinder Diesel Engine, Automatic Transmission, 7000 lb Front Axle, 19000 lb Rears, 26000 lb GVWR, 11R22.5 Front Tires, 295/75R22.5 Rear Tires, Spring Suspension, 255 in Wheelbase, 186 in Cab to Axle, 296 in Cab to End of Frame