Having same problem and looks like a lot of Ford owners are going through this. Have called Ford and transportation safety etc. No help. Ford needs to recall this.. Too many issues with same thing. Demand a recall. Stand up and be responsible ford.
Hoped it was wheel bearings had all four replaced. The noise is getting worse. The mileage is way to low to have this problem. Wish it was not rear independent suspendtion. If it was like my '98 F150XLT 4X4, I would have it fixed by now.
Rear end started roaring at 15000 miles. Ford worked on rear end 5 times and each time the whine would go away. It would then come back after a few thousand miles. It has 180,000 miles on it now and whine is really very loud I would love to know a permanent fix. I've replaced only the water pump and alternator so I would like to get rid of the whine. My wife has had 2010,2011, and 2013 4 x4 Explorers with no problems at all on any of them. She put 25 to 35,000 miles on each and they were perfect. Maybe she has been lucky.