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It's more than likely a NP208. Could also be a Borg/Warner 1345. Since all Ford transfer cases of any year bolt up to any Ford 4x4 transmission, someone could have swapped something else in there also.
If you want to spring for the synthetic gear oil, they say it will shift better in the winter. It's pricey though. They make a dexron VI that is a semi-synthetic you could put in the transfer case also. Cheapest place it get it is Walmart.
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