This has not happened to me but I am curious about the consequences of running the tranny dry momentarily while using the tranny pump to remove old fluid from a disconnected cooler supply line. I always pump out a couple quarts, stop engine, add back same amount of fresh fluid and continue until done. If, by accident, I pumped until no more came out, would the tranny pump suck air and do permanent damage? My understanding is nothing bad will happen providing you promptly stop engine. Any air that may be picked up by the pump running dry will quickly self-purge. Thanks.