ESOF Advice Needed - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 01-16-2011, 12:53 PM Thread Starter
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ESOF Advice Needed

2004 F-250 ESOF, will shift into 4X4 sitting still, but moving, nothing. When sitting, front shaft locks up when shifted in 4X4, I hear the vacuum solenoid shift, vacuum hubs engage, shift into 4X2, front driveshaft disengages, hubs unlock. When moving (under 55mph), no 4X4 light, no engagement. I checked the two 4X4 relays on the fender, the terminals are clean, and they engage. Any suggestions?

John
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post #2 of 3 Old 01-16-2011, 03:16 PM
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Do you have any warning lights on in the dash like abs?

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post #3 of 3 Old 01-16-2011, 05:35 PM Thread Starter
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No warning lamps, I will check for codes tomorrow.
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