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  • 4wd problem

    i am working on my 94 yj and 4wd doesnt work. it will go into low range but front axle wont engage. i have the wonderful vacuum disconnect but my question is, does the transfer case it self require any vacuum or does it merely create the vacuum to engage the front axle? thanks

  • #2
    it requires vacuum. i might be wrong but i believe its the red line that comes from the source.

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    • #3
      The transfer case neither requires vacuum, nor creates it. The vacuum is created by the running engine. There are no vacuum lines running to the transfer case. It shifts by manual engagement. There is a sliding collar in the passenger side front axle, which moves and connects the two axle shafts. The vacuum disconnect is what moves this collar. This action has no bearing on what the transfer case is doing. If the vacuum disconnect doesn't work, than the power transfer to the front axle does not make it to the wheels. The vacuum system actually works pretty good considering, if it is working order.

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      • #4
        Apologies. There is a vacuum switch on the transfer case. This is activated when 4WD is engaged, allowing the engine vacuum to move the shift fork in the axle. The transfer case does not provide or operate on vacuum, though.

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        • #5
          thanks

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          • #6
            thats what i was implying maybe next time ill elaborate

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            • #7
              moist likely you have a vaccuum leak or the shoft motor oin the front axle is bad.... it's not hard to check that shift motor

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              • #8
                well i think it is the vacuum lines cause it worked fine until i took the drive train apart

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