OK, Just to add to the confusion...
I went to my local dealer today to pick up a filter, a gasket (just in case I need it) and 8 qts of Mercon-SP.
The parts guy was able to get the correct filter ($51) and gasket ($15) for me. When he asked how many qts of Mercon-SP I wanted, I told him I was only doing a pan drop and a filter change, and that I thought I would need between 3 and 4 qts.
He suggested it sounded low, and he (without me) went out to the shop floor to ask one of the techs. He came back and said the tech said that "We don't do just the pan-drop and filter, we do a complete flush, so I am really not sure how much a pan-drop and filter change would take. I would get 8 qts and return what you don't use".
I explained (to the parts guy) that the Ford shop manual does not recommend a flush because of the thermostatic nature of the fluid path. He (the parts guy) said "that's a whole different story" and really just blew me off (he really didn't want to discuss it with me), so I just completed my purchase and went on my way.
So my question, (like many here on the forum) is:
1. Is there an official Ford recommendation to flush and
2. If so, where (if at all) is it documented?
Could the tech be confusing 6R60 with another transmission?
Thanks.