4x4 does not engage
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New User
Joined: Mar 2004
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From: SUFFOLK, VA
4x4 does not engage
2000 F-250, 108,000 miles. Flip the 4x4 switch, indicator illuminates, but the front wheels do not engage. Going to 4x4 low works fine. Haven't tried engaging manually at the hubs yet. Had this problem last winter in the mountains in sub zero temps, but has worked fine since. Any ideas?
FTE Leadership Emeritus
Joined: Sep 2003
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From: Houston, Texas
If you do a search on this there are plenty of threads on this, but let me save you some trouble. From what I can remember, there are vacuum hoses, o-rings (or something like that) that cause the hubs to engage once you flip the switch. Your hose or hoses or whatever have probably dry rotted and is the source of your problem. Your hubs just might need some lubrication, new o-rings, and seals. The problem normally clears up once you take the hub off, take it apart, clean it and replace the replaceable parts. I'm not sure about this, so can someone clear up the mess I may have caused here?
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Joined: Mar 2004
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From: NEBRASKA
Toreador, is right your front hubs are controlled by vacuum, your transfer case is controlled by an electric motor. The light should be controlled by the engagement of power to your shift motor. So your problem should be with your vacuum or your hubs. It sounds funny though that it engages in 4low and not in 4high. Check your vacuum lines for leaks.
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From: SUFFOLK, VA
Originally Posted by topdogg
Toreador, is right your front hubs are controlled by vacuum, your transfer case is controlled by an electric motor. The light should be controlled by the engagement of power to your shift motor. So your problem should be with your vacuum or your hubs. It sounds funny though that it engages in 4low and not in 4high. Check your vacuum lines for leaks.
Cargo Master
Joined: Oct 2003
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From: Jefferson, Iowa
Take those auto/mans off and soak them in atf, clean them out really well. Might want to get a vacume testor and see if they can hold vacume, if it can't, the seals on the back side of the wheel assemblies are known to go bad in a short order of time. Also check the lines. If you do not have vacume, supply the vacume pump with suppliment power and see if it works, if it does, your vacume pump is fine. Then take you switch out if nothing wrong has been found yet, and make sure there is not just a bad connection. If the switch has output power, then it is the GEM module. I think ford has to program these for your truck, can get pricy.
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From: SUFFOLK, VA
Originally Posted by 78fordman
Take those auto/mans off and soak them in atf, clean them out really well. Might want to get a vacume testor and see if they can hold vacume, if it can't, the seals on the back side of the wheel assemblies are known to go bad in a short order of time. Also check the lines. If you do not have vacume, supply the vacume pump with suppliment power and see if it works, if it does, your vacume pump is fine. Then take you switch out if nothing wrong has been found yet, and make sure there is not just a bad connection. If the switch has output power, then it is the GEM module. I think ford has to program these for your truck, can get pricy.
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