The Dana 20 is found in 1963-1979 Jeep CJ-5, Jeep CJ-6, Jeep CJ-7, Jeepster C-101, Jeep Commando C-104, Jeep J-Series Truck and Jeep SJ Wagoneers. It's design was outstanding and remains one of the strongest and most refined of all the popular transfer cases. This transfer case is compact, light, durable, simple to build and capable. It features dual modes (2wd + 4wd) and dual ranges (Hi + Lo). The high range is direct drive (1:1) and the low range is 2.0:1.