Dexron in 1972 transfer case ??

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I am sort of an old-timer with a few old trucks, most of which only get driven a bit here and there. Consequently, none of them require much work or serious checking, but I am careful with them even though I may not be "up" on all the latest tricks, etc.

Yesterday decided to check all of the underside lubricants on a 72 Blazer that has only been driven about 900 miles in the past 11 years. I remember having filled the transfer case with gear oil way back when after I installed new seals in it. When I opened the top plug on the NP transfer case expecting to poke my finger in to check the gear oil level - surprise - instead got a rush of pretty red liquid that looks and smells for all the world like Dexron. Clearly the case was over-filled with the stuff.

About 1200 miles ago I had a shift kit and new seals installed in the T350 and am supposing that the trans guy not only pulled the transfer case but also drained it and later refilled it - but with Dexron??

Or - I do not know how - but could the Dexron somewhow be leaking into the transfer case from the T350?

Can any of you guys with big 4X4 knowledge fill me in on this? The truck has not been run in 4WD since the trans work, so no problem in that regard. But is Dexron or something like it normal and OK in there?

Any info will be greatly appreciated.