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I have the same problem. I found out that my vacum motter is good. I jacked the truck up-all 4 wheels off the ground and jack stands on all 4 corners. on the vacum moter(on the axle) the connection on the pass siide is the vacum, I put a hose on it and sucked- the 2 conections are drivers side is on , pass side is off. I could engage the 4wheel drive this way. then I traced the vacum line to the back of the trasfer case on the top there is a vacum switcth, 4 lines to it red = black to vacum moter and white +green to the front of thetruck drivers sidebehind valve cover. this is as far as I got, I need someone else on top of the truck as I wiggle the wires to see where they go- also help to remove the air cleaner. its 20degrees outside and My fingrers are frozen. oh, I had no vacum at the switch on top of the transfer case,..

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13y ago

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