Fender serial number dating service
The vehicle serial number had a prefix of CJ-3A for the first 2 years of production.During this time the serial numbers continued to climb with no regard for model year.The CJ-2A/CJ-3A Parts Book (copyright 1949) states that the beginning of production vehicle serial number is 10001 with engine serial number 10001.
Unlike modern vehicles, the difference between CJ models was not distinct.
The commonly accepted description of the CJ-3A seems to apply only to the mid production vehicles.
The lack of factory parts information from the CJ-3A time period makes it very difficult to decide if and when changes were made.
The first CJ-3A engine serial number should be 3J10001 and then increase through out the remainder of production.
Serial number lists of other models of Willys vehicles indicate that engine serial numbers increase at a faster rate than the vehicle serial numbers.
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Later in 1949, and for the remainder of production, the body tag was eliminated. The body tag to the left is from a 1949 CJ-3A, thanks to Andy Testo for the photo.