Kits are available for both the Dana 18 and Dana 20 transfer cases. These kits are shipped complete with the necessary hardware and gaskets to obtain the 3.15:1 low gear ratio.
The Dana 20 kit fits transfer cases 1963 to 1979 in CJs, Jeepsters, Jeep trucks, Wagoneers, and 1972 to 1979 Scouts with a six spline drive gear. This is a 5-gear low range kit replacing the stock 2.03:1 gears. A slight amount of internal case grinding is necessary.