The factory fluid is Motorcraft Mercon LV. There is a Ford Tech on youtube that shows how to change the fluid in one of these transmissions and how to get the correct level of fluid. It looks like it's a pain in the *** since you have to have the car raised up and level to get the correct level reading. This guy also recommends changing the fluid in these transmissions at 60,000 miles and not at the 150,000 that Ford recommends.
2014 GT/automatic/Sterling Gray Metallic/GT500AB/GT500 OTA pipes/Bob's oil catch can/Ford aluminum finned diff cover. Ford STB.