Question about 1999 GMC Sierra

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Ford F350 Diesel 4x4 problem

The 4x4 didn't work for my 2002 F350 diesel. After some checks, I replaced the vacumm solenoid, which fixed the problem.
After a week, the 4x4 is no longer working again. The dash light does come on, but the hubs don't lock.

What has gone wrong? The solenoid couldn't have gone in a week. Is something else the problem?

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  • Anonymous Apr 06, 2009

    On my 03 7.3, I have to manually lock the front hubs in order to have the 4X4 work.  I have been told that I have on the fly and that my 4X4 should engage just with the knob on the dash

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Jump start a 200 F300 ford truck

Posted on Apr 29, 2011

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Check to see if you can still turn the hub lock outs by hand (if app) My guess would be not. They probably need to be replaced or taken apart and re-greased.

Posted on Mar 03, 2009

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