Everytime I drop the pan on my tranny, I am surprised at how much fluid it takes to fill it. My chiltons says something like 5 pints. Yeah right. I buy my ATF in the gallon and it usually takes one and 3/4 (about 7 quarts) to fill it back up. I just fill it up a bit, start the truck, and keep filling until the level is right (periodically shifting in and out of gear to get the ATF going everywhere).