Dana 60 gear ID
I don't know how to determine whether you have a thick 5.38, or a standard. (If I had to make a guess, looking at what you have pictured, I'd guess a standard) if you have a standard5.38, then the highest normal gear that will fit is a 4.56. I THINK there are 4.10 gearsets for the low gear carrier (higher numerically)
Dr Diff will know for sure about the gearsets, and how to tell about your spool. Thats,That's, we recommended calling him.