I knew that was coming, and I'm working on getting that info. At the time I created the post I realized the info was missing, but did not see any way to save the post as a draft, so posted it. I'll modify the original post when I have the goods.
That said, I would think that at least some of the marks (if not most) would be a function of the axle assembly plant (Sterling Heights, MI?). Those would not change based on the assembly plant. Once physically at the specific assembly plant, something such as the rotation number might be applied. And they of course would probably differ per plant, the basis for your question I assume. The other assembly plant task would be to fill with oil.
If the assembly plant did any more involved sub assembly (axle installation, third member installation, etc.), then I would say that the majority of the markings would transition from the axle plant to the assembly plant.
Any ideas on what the assembly plant work was done for the rear axle assembly as a whole?
Thanks.