I wanted upgrade to OEM nav in my '10 (from the 6 disc player). I was told by the dealer that quite a bit of wiring and and the steering wheel controls are different and Ford advised against it. I finally contacted Oemautopartsco.com who supplied a kit which allowed a seamless install. Mine had Sync and that was also retained. I was able to install the unit myself. They program you VIN so you don't have to go to the dealer to get a flash.
Customer service was excellent.
Sport Tracs are not listed on their search, but f you search for an explorer you will get to a ST.
Overall, I was very happy with the upgrade.
:banana: