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Old 07-29-2013, 03:31 PM   #1
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CAD 4x4:

Quick question,

On the front axle CAD diaphragm there are 2 vacuum lines that plug into the side of it. When the t-case shifter is in 4wd, (high or low), does than mean there should be vacuum on -both- lines? Or is vacuum applied to both lines when it's on 2wd?

Trying to figure out why my CAD fork won't go back to the 2wd position, the fork is all the way left and hits the indicator switch, so the light is on all the time even when I'm not in 4wd. I think it's either a vacuum line problem, the t-case vacuum switch, or the fork is jammed up.

I know all about the posi-lok by the way, if I can't isolate the problem ill upgrade to that.

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Old 07-29-2013, 03:46 PM   #2
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Vacuum should pull the fork to the left when in 4x4, and to the right when in 2x4. So you should only have vacuum on one line at a time.

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Old 07-29-2013, 03:48 PM   #3
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The vacuum switches sides when you hit the lever. It goes from one side to the other causing the shift fork to slide over. There are two styles of lights though. One style is on the CAD, and actually unscrews from it. You will see two wires if that is what you have, with a sensor that looks just like a reverse light sensor on a transmission. If your CAD is stuck it could make the light stick on. The other style from earlier YJs is on the firewall. I have not worked on those. I believe it is after 92 they were on the CAD itself. My CAD failed, and for less cash then a posi cable I swapped in a solid axle. Then you can put a sensor from a Cherokee on your TC for the light to keep working when you shift in and out of 4X4.
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Old 07-29-2013, 11:25 PM   #4
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Thanks ill pull those vac hoses off when it's running and see which one is/isn't working. Then I'll go from there. I have the kind of indicator switch that's on the CAD, it has a plunger that makes contact with the fork when the fork moves left and engages the 4wd. I already checked out that indicator switch to make sure it was working correctly, and it looks like the fork is stuck in the engaged position from the view hole, haven't actually taken the CAD cover off yet to see but I'm going for the t-case switch first to see if that is actually working.
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Old 08-05-2013, 10:45 PM   #5
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Quote:
Originally Posted by OverkillYJ View Post
The vacuum switches sides when you hit the lever. It goes from one side to the other causing the shift fork to slide over.
Ok, so I pulled the vac lines off the CAD and tested the vacuum. I got vacuum on the one line in 2wd, and when I put it in 4wd, the vacuum was still on the same line, it didn't transfer over to the other line. Does that mean my T-case switch is shot?
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