There are tags and casting numbers on components to indicate when they were produced. These items are then compared to the production date of the vehicle and the vehicle data plate to confirm originality.
The following tag is located on on of the rear axle center section bolts. The numbers WCZ-V1 indicate a 67-70 model rear axle with 2.79 ratio. The next line begins with 2.79 confirming the gear ratio. The next set of numbers (7DC) is a date code indicating the third week (C) of April (D) in 1967. The final set of numbers (930) is the plant code.
The next tag was found on the passenger side of my tranmission near the bellhousing. The RAN D 1 portion indicates a 1967 3.03 3 speed manual transmission. The next number (K063574) is the serial number of the transmission.
There is a casting number on each motor but it is hidden by the starter. I'm unable to remove mine because of the way the headers are welded to the exhaust. However, on the front right flange of the motor an assembly date is stamped. On my motor this stamp is 7D17 for April (D) 17th 1967.
The dates are the most important as my Mustang completed assembly on 04/21/67. Each of these components are date matched to the vehicle. They also match the dataplate which I will not post as it contains the vehicle VIN. These items are the best evidence available to confirm originality on a '67 Mustang.
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