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Hi,I just replaced the switch on the trainney that goes to the front diff to
engage 4x4.Still doesn;t work. I took off the line that goes to the front
activator no air. What next.That light doesn't come on for the 4x4 it;s dead
 

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well, if you do not have vacuum in that hose going to the front it will not kick the 4wd in which in turn will not turn your 4wd light on. you need to follow that vacuum hose and look for any kind of holes or anything causing it to lose it's vacuum. good luck
 

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did you check the lines from the transfer case to the vacuum canister on the frame? vacuum leaks suck but work your way back to the engine, its leaking somewhere.
 
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