The drive axle identification code can be found in the space marked AX on the Vehicle Certification Label. There is also an identification tag located on the axle.
The plant code on the identification tag is the official service identifier. The plant code for a particular axle assembly will not be duplicated. As long as that particular axle assembly never undergoes an external design change, the plant code will not change. However, if an internal design change takes place in the same axle during the production life of the axle, and the change affects service parts interchangeability, a dash and numerical suffix is added to the plant code.
See Figures 1 and 2