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Unread 09-19-2012, 09:59 PM   #1
proFISHent
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YJ jeep question on vacuum system

Like some of you guys have read, I am new to jeeps. Have an 88 YJ sahara. I was owed money so I was given the jeep as pay.

Needless to say the 4x4 dosnt work. Went to a local jeep place and asked what I need to fix it. They said its most likely vacuum system (which I have read SUCKS), the guy said I need to buy a pasenger side axle for I BELIEVE he said a TJ model jeep and I could delete the vacuum system.

I googled deleting the vacuum system and could find a ton of stuff on a posi loc system to engage the 4x4 instead of the vacuum system but I dont know if thats what I need.

Can anyone help? is this ALL I need or is it going to be one of those when I get that part I also need this and that too? Easy to install?

If I delete the vacuum system can I take all the old parts out so there's less junk down there?

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Unread 09-19-2012, 10:14 PM   #2
seattle_yj
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A bunch of us were just talking about this on another thread. Check it out here: http://www.jeepforum.com/forum/f12/f...ocker-1418594/

So yes your right about the posiloc, it is basically a manual override for the vacuum actuated switch. From what I could tell its about 150 bucks and not too difficult to install. There is also a way to manually 'hack' this part to perma lock it. That hack is located in the stickies somewhere I believe. Then yes you can remove the vacuum line non sense.

I'm sure someone will be along shortly to chime in as well.
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Unread 09-19-2012, 11:03 PM   #3
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thanks seatle!!!!! Love this site!
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Unread 09-19-2012, 11:46 PM   #4
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Skip te posilock and just permalock the fork over. I know dodger did a writeup a while ago but I came upon the same results by just messing around with it. You need to lock the form over like this:

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Unread 09-20-2012, 12:34 AM   #5
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Quote:
Originally Posted by Anticanman
Skip te posilock and just permalock the fork over. I know dodger did a writeup a while ago but I came upon the same results by just messing around with it. You need to lock the form over like this:
So if you slide that actuator over, will it just stay in place or do you need to add some hardware? It seems like if you slide it over it would slide back during daily driving.
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Unread 09-20-2012, 12:37 AM   #6
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Nope. Remove the clip holding the fork onto the shaft (that slides) and lock the shaft in place essentially immobilizing it and sandwiching the fork into the locked position.
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Unread 09-20-2012, 04:25 AM   #7
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Originally Posted by seattle_yj View Post
From what I could tell its about 150 bucks and not too difficult to install.
A brand new vacuum actuator was $89 from Advance, the Zone one required taking your old one apart and putting parts to the new one... But I recommend Canman's way or the one piece.
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Unread 09-20-2012, 08:03 AM   #8
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Quote:
Originally Posted by Anticanman View Post
Skip te posilock and just permalock the fork over. I know dodger did a writeup a while ago but I came upon the same results by just messing around with it. You need to lock the form over like this:

I opted for the posiloc last year to get rid of the non-functioning vaccuum actuator. Over the last month of so I've gotten a squeak/knock/? and found out that when I engage the posiloc the noise stops.

If I engage the posiloc and leave it engaged is there any chance of damaging the posiloc or the axle shaft? I know the front DS won't spin unless the tcase is engaged so no worry there. I just don't want to take the chance of the intermediate shaft being damaged from constantly spinning when it wasn't designed to. This is my DD and I'm putting about 25 or more miles a day on it.
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Unread 09-20-2012, 08:56 AM   #9
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The front driveshaft WILL spin if you have a solid shaft on the passenger side. You'll have to get your shaft balanced if you notice any vibrations.
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Unread 09-20-2012, 09:46 AM   #10
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Quote:
Originally Posted by Anticanman
The front driveshaft WILL spin if you have a solid shaft on the passenger side. You'll have to get your shaft balanced if you notice any vibrations.
Hmmmm... That's one reason I didn't go the TJ axle shaft route. I'll tear onto it today and see what the deal is with the noise. Thanks for the info.
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Unread 09-20-2012, 05:09 PM   #11
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ok. So if I do what was suggested and go with a "permalock" system that means I will always be in 4 wheel drive? sorry, new to the stuff. It is not going to be a daily driver but I will be using it highway going to and from hunting lease so I dont want things so stay engaged.

Is there any downsides to the posilock?
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Unread 09-20-2012, 05:39 PM   #12
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you will not be in 4x all the time. Basically you wind up with a solid axle up front. You only are in 4x when you engage the lever.
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Unread 09-20-2012, 05:50 PM   #13
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The permalock will take the vacuum out of the equation so you only have to worry about the mechanical aspect of the transfer case going into gear. If you leave the wires intact t will say 4x4 all the time but it's not necessarily in 4 wheel drive. You may have to get your front shaft balanced if you lock the fork up front
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Unread 09-21-2012, 04:52 AM   #14
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Quote:
Originally Posted by Anticanman View Post
The permalock will take the vacuum out of the equation so you only have to worry about the mechanical aspect of the transfer case going into gear. If you leave the wires intact t will say 4x4 all the time but it's not necessarily in 4 wheel drive. You may have to get your front shaft balanced if you lock the fork up front
After you decide which method to make a solid front axle, you can change out the vacuum switch on the transfer case and use an electrical one from a mid 90s Cherokee to have your 4X4 light work when you engage the transfer to 4hi and 4low. It will cost about $20 for brand new stuff or about $5-10 at a junkyard.

Oh yeah and I used to live in Clermont! Its a lot different from when I lived there.
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Unread 09-21-2012, 05:09 AM   #15
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I tried 2 different posi lock cables, returned them both as the sucked and would not engage properly or stay engaged if it actually got it engaged.

If you have plans to put a locker up front, that is when you change out the axle to a one piece as you will already be taking it apart otherwise do it Canman's way.

Also if you have the locker in the front you won't need the light as you will easily be able to tell if you are in 4wd by the way it pulls.
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