Straight from the manual Mr. Smartass.
4A provides electronic control four-wheel drive with power delivered to all four wheels, as required, for increased traction. The information display will display 4A when this mode is selected. This mode is appropriate for all on-road driving conditions...
Sorry but your wrong. 4A runs in 2H 99% of the time and only engages 4wd when it senses it needs it. It's literally in the owners manual and numerous ford engineers who designed the system say the same.
UPDATE: Ford found the transfer case was indeed bad stating it was stuck in 4H ALL the time and are replacing it under warranty. Multiple techs took the truck for a drive and immediately knew something was wrong.
Considering the fact that doesn't apply to vehicles with 4A because everything on there is for base models WITHOUT 4A. Sport and slippery default to 4A in my vehicle.
Thats what I figured. I'm not stupid this truck is NOT supposed to bind up on a 3mph turn into a parking spot. Also even driving in a straight line I'm getting power to all 4 wheels like the exact same issue you were having.