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I knocked a vacuum line loose that runs down past the fuel filter and I can't find where It goes... any one have any idea where Its hooked
 

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There's a vacuum line that runs from the cruise control box under the driver side battery, to a line back by the fire wall, that it could be.
 
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what color if it is gray in color it should go to the top of the transfercase. I have seen them get dry rotted and crack down there.
 
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