If you say the sound goes away when you're in the throttle, could the engine noise just be louder than the grinding sound?
If the trans was leaking and you haven't filled it, then it won't leak anymore until you fill the thing back up.
It would be a good idea to clean everything and fill up the transmission, and then try to see where it is leaking...and make sure to park it somewhere that is clean, so that if it leaks, you'll be able to tell.
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