Although this article is intended as a primer for historic military vehicle (HMV) transfer cases in general, it will focus mainly on the Dana Spicer 18 as found in most U.S. military jeeps, including the WWII Ford GPW and Willys MB, as well as the M38, M38A1, M170 and M606. The Dana Spicer 18 was also fitted to Willys/Kaiser civilian jeeps, such as the CJ2, CJ3A, CJ3B, CJ5 and CJ6, as well as used in four-wheel-drive Willys pickups, station wagons, and the FC-150 and FC-170 Forward Control vehicles. Additionally, it was used many foreign-licensed Jeep models, including those built by Mahindra Jeep in India, and Mitsubishi Jeep of Japan, as well as in early model International Scouts.
WHAT IS A TRANSFER CASE?
I bought my first jeep, an M38, when…