'05 Ford Excursion Limited
 

On my front hubs, it says Lock & Auto (no Free) Does the Auto mean the Hubs should Auto lock when 4x4 is applied? The only way I can get into 4 wheel is to Lock the hubs and the Auto seems to be the free spin, Just curious!

Yes.....they should auto lock when you flip the switch and are set on auto........you likely have a vacuum leak.

Thanks man i'll run down the lines.

if you have a wheel bering out it will break the seal and also create a vacuum leak :c:

Let us know what you find