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The date code is stamped on the tag. The first number is the last digit of the model year of the decade, the next digit is a letter and represents the month (A is for January, B is for February, and so on), and the last two digits represent the day of the month. This format is also applicable to casting date codes.

The date code on this axle tag is 7AC, and it corresponds to the 7th year, 1st month (January), and 3rd day. The WFE-V2 helps us find the decade of the 1970s. This axle tag belongs to a 1977 F-150.

A metal axle tag is typically located on the driver-side front of the third member. It is underneath one of the nuts that holds the third member in place. In most cases, the tag has been lost. On this particular third member, the original copper washers that were under the factory fasteners have been discarded as well.

Some tags reference the week of the month instead of the exact day and just use a letter (A to E) for first through the fifth week of the month.