Section 05-00: Axle and Driveshaft—Service | 1993 Mustang Workshop Manual |
The Plant Code on the axle identification tag is to be used as the official service identifier.
The Plant Code for a particular axle assembly will not be duplicated. In
addition, the Plant Code will not change as long as that particular axle
assembly never undergoes an external design change. 
If, however, an internal design change takes place
in the same axle during the production life of the axle and that internal
change affects service parts, interchangeability, a dash and numerical suffix
will be added to the Plant Code. 
The Vehicle Certification Label (V.C. Label) is affixed on the LH front
door lock panel or door pillar. The V.C. Label contains the axle ID code in the
lower RH corner. 