About the aftermarket solution for the diff wire, the thing is only us in northern places where there is salt have these problems, where they don't use salt on the roads the problem must not be there.
if you have a flashing awd, that is not it, the wire problem on the rear diff would lit a solid awd symbol. A flashing awd symbol for 10 seconds is a sign the awd system isn't working, so either transfer case or front diff teeth that are chewed up.
My light is on solid. The rear wheels don't drive when the front wheels spin in mud/snow. I've had all the problems. Broken transfer case (replaced 3x under Mazda extended warranty), the last time the transmission output shaft splines were sheared off.
It makes sense that only the northern/salty roads that cause the problem. But there must still be a few million of these units our there. Unless Ford ran the wire into the case in a different manner?