I replaced the module (Ford part # TM 101) and all is well. Thank you for pinpointing the problem. It was an easy task to replace: remove the kick panel, two screws, and two harness plugs, then retrace steps. It is a crying shame that the part is so pricey. This electronic 4-wheel drive set-up is a poor replacement for the manual shift lever on the floor which I never found to be a problem on my '82 F150 4X4 (although it also had an ignition module that I had to replace four or five times). This is certainly NOT one of Ford's "better ideas".
I noticed on other message boards that I am far from the only one with this problem. Ford should sit up and take notice of this epidemic and do something right by their loyal customers. Thanks again for you assistance.
Tuesday, December 9th, 2008 AT 2:56 PM