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True, the drain plug on the trans pan will remove about 4 quarts, the torque converter drain plug will dump about 7.5 quarts, which leaves about 1/2 quart maximum in the system (for my 97 cougar V8 sport example). It's just a personal peeve of mine that I don'tam not in favor of disconnecting pressurized fluid lines for routine maintenance. The more you disconnect them the greater the opportunity for a line to start leaking....and if its not leaking I really prefer not to take a chance.
With draining 95% of the trans fluid every 15,000 miles, while it is a little "early" by most peoples standards, the fluid remains very clean, without odor and....I have never had an automatic transmission failure (including wifes 87 Celica GT). We typically keep our vehicles for 10+ years and sell them with 85k-130k miles.
actaully ford did away witht the t/c drain plug years ago back in 03. so the pan or a flush is all that works on these.
Don't do it. Since Ford is gonna sell you that truck for somewhere in the neighborhood of $30-40K you've gotta figure that they're selling you the fluid in the trans for around $200. So keep it in there.