I just came across this little write up a few weeks ago. A contractor friend has a 2006 f150 whose 4wd system is driving him nuts. The last straw was when he had to have his son pull him out of a real muddy patch of ground with his 2wd GMC. The Shame! Any way I printed out the write up and gave it to him. I am no mechanic and didn't really know if the information related to 2006's, but they got everything squared away and now I am his new best friend and hero.
Still, I feel more confident with my real old school manual hubs and manual transfer case. Very nice job on this write up, would like to see more of the same around here.