If it was leaking into the trans via an interior radiator failure, I would think you would you know it by now, given the amount of water that it sounds like you've lost. Have you looked at the trans fluid?
Maybe the thing to do at this point is go to a radiator shop and have them pressurize the cooling system and wait (and wait and wait) to see where it's going. If it loses water and you can't figure out where, you might want to pull out the spark plugs and hand crank the engine a couple revolutions lest one of the cylinders becomes hydro locked.
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