Well I just picked up my Expy from the dealership after having more warranty work done (APIM was replaced) but also had them check out a different whine noise while it was there. I actually thought the noise was coming from the transmission or transfer case but I was wrong. It needed new pinion and side carrier bearings and races. Hopefully this time it’s fixed right. I took it to a different dealership this time where I have a friend who was the technician that worked on it. It is perfectly quiet this time! I should’ve taken it to him instead of the dealership I bought it from the first time. I’m so lucky I’ve still got a technician connection at a Ford/Lincoln dealership!