2003 truck 4WD squeky

Hi all... i noticed when I put my 3wd in on my 2003 SD F250 it seems that the front hubs have a medium to high pictched squel when moving
slowly.. its not loud but is audible.
When i go over 2 mph the sound is not audible.. i hear it when backing up slow ly or foward.
I also notice if i take it out of 4wd and do not back up that the sound stays there.
If i back up after going back to 2wd then the sound goes away... is this just suqey hubs? or should i have ford look at this?>
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.