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Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
Is the 4x4 light staying on or just the front hubs staying locked?
Thanks for asking your question and letting me try to help you.
The front hubs need engine vacuum to unlock. The solenoid that does this is on the firewall, squeezed in next to the battery. While running is there at least 15 inhg of vacuum to this solenoid?
Are there any lean codes, mpg issues, idle concerns which would indicate a vacuum leak issue?
Any way you can post a picture. Ford images in the repair guides are not live images?
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Do you see the line in the file below?
The line that you have broken off and in hand does it have vacuum while running ir does it need vacuum from the other end that you can not find?
With the engine running, spray short bursts of starting fluid or brake cleaner. This will find the other end because that vacuum line will suck in the spray and cause it to rev the engine.
Give it a shot and let me know the results. If Ford had vacuum diagrams I would give them but they do not.
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