Guys, I dropped the pan on my 6R80 transmission and replaced the filter and bulkhead connector. It took 7 quarts warm in all to read between the hash marks on the stick while running. I was able to pump in 4.5 quarts cold before the fluid started running out the fill hole and then ran the truck (parking brake on) through all gears (10 seconds each) for a couple minutes. I was able to get in another 1.5 quarts. I then drove the truck, getting to full operating temp, and then pulled the stick... down 1 last quart. Word of advice is to wear thick long sleeves and tape your sleeve to your glove. You don't want your wrist/hand touching the exhaust. All fluid are replaced...time for a Bud Lite.
And yes, Mr. Makuloco is a genius and much appreciated.