Seems to switch in and out of four wheel drive while driving

I did find this a few minutes ago.

I do not know if it will help you now.

The Medic

This is probably the same thing.

The Medic

If there are no chunks missing, the splines I can see in your picture look just fine.

I believe your problem is in the differential itself, so far I have not found an exploded view or anything except that recall that might shed some light on exactly what might go wrong with the differential.

Maybe one of those phone numbers or some homework might, at minimum, hook you up to a Ford tech guy that might tell you what their solution was (rebuild, replace, replace with a different unit).

It would be nice if it was still considered an issue and they might take care of it.

I never have luck like that.

The Medic

Sounds like a plan, please let us know what happens.

Yep, you are headed in the right direction. Here are diagrams and instructions to help show you how to remove the front differential:

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken

Insure your salvage find has the same gear ratio.

The Medic

Nice work, we are here to help, please use 2CarPros anytime. Cheers, Ken