I called ford for the transmission filter kit and was told the factory fill mercon V has a material incompatiblity with the transmission and that you have to use a different mercon V fluid thats in a black bottle(excelda).
(I have a copy of the internal special service msg)
It says this only applies to the 5r55e/n/w/s
all others such as 4r44e 5r44e etc are not included.
The part number for the reformulated motorcraft mercon V is
xt-5-GM (by the gallon)
I will update this wends night after work.
I will scan in a copy of the letter too.
Oh and the black bottle stuff is $22/gal ugh. The red stuff is <3/qt at walmart.
EDIT: Added PIC Its big (sorry 550k).. if you zoom in you can read all the text. I edited it again and added a closeup of the chart for clarity.