Ecostan

Hey guys I have a 2014 f150 fx4 with roughly 13,000 miles on it and at about 5,000 miles I experienced a hard growl and grind from the front end while driving right after start up..if I stop and put it in 4 high and than back to 2wd it goes away and there is a pop coming from the front drivers side. And just a few days ago it happened again, now when I go to use 4wd the front end grinds. This should not be happening and I'm considering bringing it to the dealer, any help?