Safe to put in Mercon V in A833?

If you took 20 or 30 minutes to take one of these apart you'd be "a guy who really knows these trans".
There's absolutely NO rocket science here whatsoever. Put a lubricant in it. I use what the engineers engineered it for- gear oil.
Why did it need a rebuild ?

69-340 said
I had my A833 rebuilt by a guy who really knows these trans. Apparently I can (should?) put in ATF.

I have a couple bottles of new Mercon V from the Ford dealer that I bought a few months ago that I didn't need. I was wondering if it's safe to put Mercon V in the trans? Mercon V is the replacement for Mercon fluid.... Thanks.
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