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post #1 of (permalink) Old 03-10-2001, 11:09 PM Thread Starter
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yj vacuum system sucks..

Boy does the yj vaccum system suck, I had read about the problems in 4 x 4 magazines but now I have actually experienced how poorly the system was designed. I just got done replacing the vaccum harness and switch, the system had been working allright for a few weeks and just the other day I went to use it and it wouldn't engage the hubs. I know I should probally just change the axle but what is the cheapest way out? Ive heard about the cable but don't know how much it costs. Maybe I should just weld the cylinder to the 4 wheel side and have them engaged all the time so I know my 4 wheel will work! Any suggestions?

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post #2 of (permalink) Old 03-10-2001, 11:24 PM
 
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Re: yj vacuum system sucks..

dont weld it into 4 wheel drive full time if you do any street drivin it will break all kinds of expensive parts the cable conversion i believe is under 150 beans and seems to be the best fix

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post #3 of (permalink) Old 03-10-2001, 11:28 PM
 
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Re: yj vacuum system sucks..

Is your shift collar stuck on the axle splines? Try removing the shift motor from the axle and try to slide the collar by hand. If it is stuck, free it by gently tapping on the collar with a hammer and screwdriver on the collar's center groove. Then take some axle grease and slather a good amount on the splines and work the collar back and forth by hand to work the grease in. Put the motor back on the axle, making sure that the shift fork rides in the collar center groove. Check the fluid level in the front diff and add gear oil if necessary.

If the collar is stuck on the splines, it doesn't make a difference what kind of actuation system (cable or vacuum) the axle has. It would also be a bad idea to weld the collar in the locked position Good luck!![img]/wwwthreads_images/icons/smile.gif[/img]

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post #4 of (permalink) Old 03-10-2001, 11:52 PM Thread Starter
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Re: yj vacuum system sucks..

what about in the older cj's where the axle was locked in all the time? Why would that be different in my yj dana 30?

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post #5 of (permalink) Old 03-11-2001, 12:16 AM
 
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Re: yj vacuum system sucks..

older cj jeeps had lockout hubs which locked the axles in and out yours are are driven when you connect the axles with the coupler still think the cable system would be the best fix for your stock axle

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post #6 of (permalink) Old 03-11-2001, 12:46 AM
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Re: yj vacuum system sucks..

i have the fix for you it is called 4x4 posilock it is a cable the takes place of the vacum it works great and if you have a front locker it is even better the posilock go for 199.95 plus shipping i have one on my personal jeep and i love it

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post #7 of (permalink) Old 03-11-2001, 08:45 PM
 
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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]



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