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I am pretty sure all civilian 3/4 ton trucks and the M880 series all had Dana 60 rear axles. What I found out the hard way is that the wheel ends are different between 1976 and 1977.
Data plate looks legitimate, I suspect you have a truck that the Navy bought after M880 production ended in 1978, and since it was equipped just like a M880, Chrysler stamped that on the data plate. M880s were 1.25 ton rated, even though they were 3/4 ton trucks in civilian trim.