I knew that there was a CJ-4 prototype, but never had any information on it until I was browsing through some old posts on the Hemmings Blog and came across this post. As the article in the photos below state, there was only one built as a prototype. For some unknown reason, it was never built. Instead, Willys went with the CJ-3B, which is the higher hood version of the CJ-3A. Enjoy!