If I did a thread about it I don't remember....But I wouldn't run it dry....I drained the pan, then refilled, then with the line disconnected start the engine and let it pump a qt or 2 out then shut the car off and refill the pan and do that 2 or 3 times.....So if you do it that way it's not really running the trans dry because there is always something in the pan for the pump to draw from.
However, after watching some videos I'm not even sure that was effective because the bypass valve probably wasn't open so I was likely just flushing out the pan and not the converter.
So now I'm just doing more frequent drain and fills.