4x4 only works when locked in - Ford Powerstroke Diesel Forum
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Old 09-14-2013, 02:03 PM
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4x4 only works when locked in

I have a 99 7.3 I had a vacuum leak in the hubs so I took them off and replaced all the orings. That solved my vacuum leak but when I switch to 4x4 on the dash it does not lock in. It does work when I get out and lock them in manually. When I do lock them manually it is always in 4x4 even when the switch is on 2x4. If anyone has any idea on what this might be I would really appreciate it.
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Old 09-14-2013, 02:11 PM
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It could be a leak in the vacuum lines or possible still a problem with the hubs themselves. One thing is for sure, you still have a vacuum leak somewhere.
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Old 09-14-2013, 03:01 PM
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I just went and tested the vacuum. I have 14hg it drops down to 12hg but holds at that
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Old 09-14-2013, 03:25 PM
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I have heard that if u turn your ac on when hubs r in automatic and take off hard if there is a leak them ac will start blowing out of defrost ! Mine isnt working in auto either but haven't tested theory out yet
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Old 09-14-2013, 05:47 PM
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Your hubs need a rebuild, or you have a vacuum leak. You verified that you hold vacuum, so you need to rebuild your gear. I suggest Warn in lieu of a rebuild, but a rebuild is cheaper.
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Old 09-14-2013, 06:28 PM
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When you lock the hubs manually and flip to 2wd, your not in 4x4 unless you have a transfer case issue too. What you will see is that the front drive shaft turns but it will be in neutral at the transfer case so no power goes to it.

As for the auto hubs, like the other said it's either bad hubs or a leak.
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Old 09-14-2013, 09:14 PM
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When you have the hubs in auto shift into 4x4 and travel several feet in forward, then reverse several feet and then once more back into forward. Do all of this while the a/c is on max. If your a/c changes for the vents to the defrost... It's definitely a vacuum leak.
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Old 09-15-2013, 06:03 AM
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I must have a transfer case issue also then because as soon as I lock them in I am I 4x4 all the time.
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Old 09-15-2013, 11:54 AM
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Sounds like your transfer case is stuck in 4x4... Is that what your saying?
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Old 09-15-2013, 12:14 PM
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Yeah I believe it is. How can I get it out?
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