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I thought it was a Dana 70 in those years only if it was 10 lug? I've seen an IH box truck of the 71-72 vintage with an 8 lug D60 (didn't have the second rib of a D70).
Every D70 I've seen has a "second rib" that goes over the top of the differential case next to the cover mating surface. It looks like a second cover mating surface.
Apparently I know even less about IH and Dodge than I thought I did so I'll shut up now. haha.