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post #3 of (permalink) Old 04-02-2000, 08:50 PM
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Re: 4x4 Quit working

So, the thing that goes into the transfer case, does it send vacuum back to the diaphragm (which is under the battery, which is a pain)? When the truck is running I have vacuum at the transfer case, there are three vacuum lines that plug into the case, one of the lines has vacuum all the time. So if I understand this correctly, when in 4x2, the vacuum doesn't do anything, when you pull the transfer case lever back the switch allows vacuum to run back up one of thoes other lines and the vacuum pulls against the diaphragm, which pulls the cable out, which lets the diff engage and the light comes on. There is a switch on the diff, on the cable, when I take it out and push in the pin the 4x4 light comes on. When I put the transfer case in 4 high, I can't turn the front drive shaft like it is in 4x4, I guess it is locking at the transfer case end and the diff isn't engaged. Will replacing the vacuum switch on the transfer case fix the problem?

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