odds are it is, doing it as an aftermarket modification is a pain in the arse to accomplish most times.
get the serial number off the door call dealership wiht info
Take the vin number to the dealership that deals with your kind of SUV.
it is highly unlikely that anyone would convert an suv from 2wd to 4wd due to the fact that it would cost more than buying it that way. but yes the dealer can run your VIN and tell you most of the options your vehicle cam with.
somewhere in the middle of the vin it will say 4×4 or 4×2 for fords
With the VIn located by the windshield, that was easy.