Dana 60 4.10 sure grip value

cpearce said
What is the raised number cast into the housing just below axle tube on passenger side, right at the pumpkin, on rear side?

I was just about to ask that. Looking from the rear, lower right portion of the casting will usually say (in my limited experience anyway) 60, 70, or 80?
edit: pretty sure a 60 has a ten bolt cover......