Are you sure? The Haynes I have lists the fluid capacity at 7 quarts. The transmission is from a salvage yard; I presume it was basically dry, as it had no plugs in the fluid ports. I don't know how much fluid might be retained in the transmission cooler loop, but not much came out when I unplugged the tube ends to put them in the transmission.
At this point the fluid is well above the "add" line on the dipstick. I'll check it as soon as the car is started, but I just want to avoid adding too little.