Question about 2002 Ford F250 Super Duty SuperCab

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Is there a way to "get rid of" the vaccum operated locking hubs on my truck and replace with manual ones?

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  • witsend65 Oct 29, 2008

    nothing but problems lines keep breaking

  • wfo360 May 15, 2009

    mines a 99 but both vac lines are broke off and the vac syl. sounds to be kicking in an ou at random is this possible?



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What is the problem with your 4x4 ?

Posted on Oct 24, 2008

  • tom coady Oct 30, 2008

    block off 4x4 vac line before the lines tee off to the knuckles,this will keep vac pump from sucking in water and mud and contaminating the entire vac system.your hubs are auto/lock hubs so just turn the hub to lock when wanting to use 4x4.when not using 4x4 leave hub in auto position,as you know without vaccuum at the knuckles the 4x4 will not lock up when hub is in auto.sometimes when using the auto/lock hubs this way they do not like to unlock everytime.if the hubs do not unlock after switching 4x4 switch to 2wd and putting hubs back to auto position just back the vehicle up for about 10 feet and then the hubs will unlock.



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What is the pressure of the locking front hub when doing the leak test On a 2000 ford 250 super duty truck

The 4x4 system works on vaccum and not presure. If this is not a Diesel you may have a vaccum leak. Check your vaccum hoses from the wheeles back up to the intake for cracks. If this a Diesel Super duty the 4x4 system works off a small vaccum pump out under the hood on the passanger side right over the tire. There is no pressure it is vaccum. Run the A/C and see if the A/C is blowing up on the windshield or out the vents were it should. Change it to the floor and see if it changes, If it does not change the vaccum pump is not working. Check your fuses first. If they are ok check for voltage at the the vaccum pump. Check your ground as well. If you have voltage and the ground is ok the pump is bad.

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Had the same problem on my 2001 Super Duty.
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