My book shows 10 quarts as the total capacity of an a4ld.
If your only dropping the pan you won't fit that much in there as the torque converters hold a bunch too, and the trans cooler/heat exchanger and lines hold some. .
If you are filling an empty transmission put in 5 quarts or so, then start the truck, then put in another 4 and then start checking the fluid level as you put in the last quart.
~Mark