Question about 2003 Ford F150 Regular Cab

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2003 F-150 Supercew 4x4 won't egage

When I select 4HI Indicator light comes on but front wheels won't engage. Fuses and re4lays check out. One minute fine the next it was not working. Any ideas out there?

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  • king5234 Jan 15, 2009

    xj220 jagcar, Thanks for the info. All of my acuators seem to be working, the one on the front diff works to, the pin goes into the diff bu8t it's like it does not grab. I'm thinking it's something in the front diff. When nyou had your problem were your acuators working at all?

  • king5234 Jan 16, 2009

    If acuator is tuning the rod that goes into the front diff, could something be broken inside?

  • king5234 Jan 23, 2009

    Ok took it toa guys shop I know. Drained the front differenial and replace fluids. Old fluid looked like it had water in it, must have been freezing up. Works fine now. Thanks for everybody's information.

  • mfranko01 Feb 05, 2009

    Sometimes it will engage sometimes it won't. I've got the manual engagement type not the pushbutton. It's a

    pain I live in NW PA.



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I had the same problem... even though i have an 04 heritage edition 4x4, manual shift lever, this should help you out... on the transfer case, there should be a plug just beside the forward drive shaft... even though mine is a manual shift, that plug lets the computer know that you are in 4wd... you also have a vacuum locking forward differential, the plug i referred to tells the computer to activate the vacuum system which engages the forward diff... i'm going to take my best guess that either the plug assembly on your transfer case might be bad, OR, you might have a bad vacuum module on your forward diff - even possibly a vacuum leak in the air lines coming from that assembly up to the firewall on the passenger side... just take a peak and see what you think, both the plug and vacuum assembly are easy fixes... (by the way, the vacuum module is a cylindrical unit that has an arm coming out of it that enters the diff... the module should be mounted directly onto your forward diff.)

Posted on Jan 14, 2009

  • xj220_jagcar Jan 17, 2009

    i'm assuming you meant turning the rod... but considering that the rod should just move up and down and not turn, it's possible that the shaft could have snapped inside or it is missed aligned inside... i would pull the front diff plate off and take a peak to see if there are any loose parts or pieces of metal floatin around in the fluid...



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