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04 f-350 4x4

Can anyone tell me how the four wheel drive works specifically from the switch to the hubs mine are locked in and the light isn’t on I can’t get them unlocked.

If they are frozen, you will have to warm them up first. I am guessing that you have had the truck for a while and already know how they are supposed to work. You should guess that I don’t know how they work.

The Owner’s Manual should have that information: