4x4 wont engage - Ford Powerstroke Diesel Forum
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Old 04-14-2013, 09:34 AM
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4x4 wont engage

my 4x4 wont engage on my 2001 F350, the light comes on on the dash but it doesn't actually engage.... Any ideas????
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Old 04-14-2013, 09:57 AM
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I would guess that its engaging the front differential but not the hubs, does it work if you manually lock the front hubs?
You have a vaccum leak would be my guess. One of the vaccum hoses is cracked or disconnected, or one of the hub seals is bad. They make a vaccum system tester that checks for leaks but I would visually inspect the system from the vaccum pump to the hubs. Vaccum leaks are a PITA and a lot of people end up just replacing all the hoses.
Personally I just manually lock my hubs though.


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Old 04-14-2013, 10:24 AM
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I would agree with the above. I had a similar issue where my transfer case would engage but the auto hubs weren't. I had to get out and manually lock the hubs. My vacuum leak was in the seal of the hubs.

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Old 04-14-2013, 01:11 PM
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They do work manually, so i will check all the vacuum lines going to the hubs thx....
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