Join Date: Sep 1999
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Re: yj vacuum system sucks..
Mike, if your collar isn't stuck (I re read your original post from Feb.) then the cable system would work for you but they are kind of expensive. There is a couple of things to check on the vacuum side.
1) Be certain that the main vacuum connection (the red line) is connected to manifold vacuum, not ported (carburetor) vacuum. ie. On my Cherokee XJ ( which has the same front axle as your YJ), the red line is fed from a tee on the manifold to vacuum storage cannister line. Ported vacuum won't work all the time because the vacuum signal varies too much with the throttle position.
2) Check the vacuum axle motor to make sure the diaphram isn't leaking. Also, I've heard that sometimes the diaphram itself gets stuck.
3) You can double check the t'case switch by removing the vac lines from the shift motor and shift the t'case from 2wd to 4wd and see if the signal moves to the different tubes. Good luck!![img]/wwwthreads_images/icons/smile.gif[/img]