[wiswind]

Yes, my method is the incremental method.....add fluid in increments equal to the amount that I pumped out.....stopping the engine when the flow has slowed or started to sputter bubbles.

The method that you mention sounds similar to the way a shop would replace the fluid.....adding new fluid in the amount and rate that the old fluid comes out.

I use a Magnefine filter in the cooler line that filters to a finer level than the internal factory filter.
I change the Magnefine at 5K or so miles.
The once a year that I pull a small trailer on a trip, I remove the Magnefine filter to make sure that I get maximum fluid flow through the cooler line.
I also went to a yearly transmission fluid change (close to 20K miles), so I don't have to keep track of the mileage......just do it once a year.

There are several methods that people use, change just the fluid in the pan at each oil change, etc.....main point is to change the fluid BEFORE having problems with the transmission.
FORD lists fluid change at 30K miles for normal service, 21K miles for severe service.....and it is important to do this.....If you wait until the service mileage....a complete fluid exchange should be done.
There are people who don't think of changing the fluid until the transmission starts acting up, and they are very lucky if they get by with just a fluid change.