Ok I'm stumped. Rear end help please!

Ok so maybe this is a clue:

The website linked to below (dana) explains that there are two ways gears are made, face milled and face hobbed. In my gear pattern marks you would add shim for one style and reduce for another. So both go-bys are correct, I just have to figure out which I need to use

[ame]http://www2.dana.com/pdf/5717.PDF[/ame]