4x4 not working

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Jul 21, 2006 | 11:13 AM

bartender

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Joined: Aug 2003

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From: West End NC

4x4 not working

I have an '03, 7.3 Lariat F350. When I turn the dash switch for 4x4, my 4x4 light comes on, but my truck will not go into 4x4. If I get out and lock in the hubs, I then have 4x4. My truck has about 76000 miles. Any help will be appreciated. Jonathan

Jul 21, 2006 | 11:33 AM

PSNut

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From: New Hampshire

Quote:

Originally Posted by bartender

Jonathan,
Chances are u need to replace a couple of inexpensive yellow O rings in your front hub assemblies. Here's a LINK on how to do it. The link is actually for needle bearing servicing
but goes over replacing the O rings that are the main culprit.
Also, check out this thread on hose seal at the hubs: LINK
Nut

Jul 23, 2006 | 11:49 AM

bartender

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From: West End NC

PSNut, Thanks for the info. I went down to the local shop, but the were not able to help me. So now I have an appointment with the dealer. Hopefully, I can get away from there with a little coin still in my pocket. Later, Jonathan

Jul 23, 2006 | 10:00 PM

sgrol

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Joined: Jan 2006

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From: Gig Em, Tx

Jonathan, You may want to vacuum test your front hubs first to see if they are leaking. Problem could also be the vacuum pump, the solenoid that directs vacuum to the hubs, broken/leaking vac hoses. If hubs hold vacuum, your orings should be ok.

Jul 23, 2006 | 11:50 PM

Tenn01PSD350

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Joined: Feb 2006

Posts: 11,892

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From: Middle Tennessee

Or you may just want to pitch those ESOF assemblies in the can and go manual and be done with it. That ESOF **** makes a good spot for a gauge or chip switch.