I have a 2002 AC with 4wd and the 4.7. I have had it in and out of 4wd a lot lately (snowing a lot here in maine) This morning when I got in it and got on the road it was already in 4 high, when I got to the main road I hit the botton to take put in in 2 wd which it did but the 4wd light kept blinking. I tried backing up, circles, 4 low etc. it went to 4wd just fine but when I went to 2wd the light kept blinking even though it was obviously not in 4wd. I finally gave up and drove 15 minutes to my destination, I turned off the main road and put the truck in 4wd which it did just fine, when I parked I decided to give 2wd another try and walla it went in with no light. It now behaves just fine. So my question is what does the blinking light mean? Is there a part about to fail? I drive to a lot of remote locations where 4wd is an necessity so I would like to figure it out before it totally fails.