Thanks for all of the great advice. The more I thought about the closed system, the more I realized there would be a vacuum lock preventing the fluid from back filling. But, to be on the safe side, I'm going to put on a slightly larger pan to accommodate a little more trans fluid and stop worrying about my handiwork. In the middle of this change, I tore my rotator cuff and let some good friends finish the job. Me being me, wants to go over everything to insure it doesn't end up on the side of the road at midnight in the Arizona desert. Thanks again for all the positive feedback. Once again this proves that Hot Rodder's don't leave one of their on on the side of the road. I owe you all a beer!