Gear Oil/Diff fluid

[DesertFordRat]

I picked up some master pro 75w 140 synthetic oil to do my rear diff. Should I be concerned with specific brands or should the specs be good enough? I don't tow anything as of yet so no big concern with that at the moment.

 

[DesertFordRat]

Oh, and how can I tell if I have a LS diff or AdvanceTrac?