Transfer case Unit Leaks From the RH Side
WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
If the leak is transmission fluid, the transfer case unit input shaft seal needs to be replaced. This is inside the bore of the transfer case unit.
If the leak is brown/black gear lube, the transfer case unit larger cover seal needs to be replaced. This is located on the transfer case unit cover.