I had Ford replace them Twice ounce 25,00 again at 35,000 miles upgrade to Warn Manual hubs now at 95,000 I had them replaced again, I am not a hard core offroader I drove on beach a few times as well as a few rough muddy roads.

When button is pushed to go into 4 wheel drive all you hear is a ratcheting noise. Ford should have had a recall on this as all their parts departments knew of the problem and said to put in manual hubs. Do not replace with automatic hubs. A big Ford blunder.