Only one Willys-Overland CJ-4 was ever built as an experimental concept in 1951.

It used the new Willys Hurricane engine and had an 81-inch (2,057 mm) wheelbase. The CJ-4 body tub was an intermediate design between the straightforward raised hood from the CJ-3B and the all new curved body style of the CJ-5. The design was rejected and the vehicle eventually sold to a factory employee.