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Old 04-02-2012, 11:12 AM   #1
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Four Wheel Drive Schematic

EDIT: Newer threads on same topic added... from OP

Seeking help on my Four Wheel Drive. Vacuum lines are missing. Anyone have a schematic or better yet a full breakdown of what I need to hook it up? 1990 YJ...4.2L,6 cylinder

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Old 04-02-2012, 01:45 PM   #2
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Get this. Posi-Lok PSL900 - 4x4 Posi-Lok for 84-95 Jeep® Wrangler YJ, Cherokee XJ & Comanche MJ - Quadratec You'll never get all of the vacuum lines connected. The easiest and most reliable is the Posi Lock.

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Old 07-07-2013, 11:58 AM   #3
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posi-loc for my jeep

Now, do I just.install the posi-loc and that's it? No more vacuum BS?
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Old 07-07-2013, 12:42 PM   #4
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posi-loc install

EDIT: 3 same topic posts put in this thread....

Thinking about buying and installing a posi -loc for my 1990 YJ . Couple of quick questions: Is it a relatively easy install? I mean without significant modification to anything? And any tips or advice?
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Old 07-07-2013, 01:41 PM   #5
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4 wheel question

Ive posted about checking out my 4 wheel system on my 90 YJ. The vacuum lines are gone and Id like to check and see about a posilok. I heard it bypasses the need for vacuum lines period. One thing, I can shift my four wheel in, but it engages and doesn't shift of course...whines a lot. Im sure this is due to the fact the vacuum lines are gone. That being said, Im getting advice that posilock is the way to go...any tips??
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Old 07-07-2013, 01:53 PM   #6
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Super easy to install as long as you don't mind turning a wrench. I did it in about 3 hours, probably can take a pro about an hour. The install requires you to drill through the firewall (very easy with the right drill), and mount the lock on the back of the front axle (again not a huge issue) make sure you get new bolts and a gasket with your posi kit.

Edit

You will probably break the bolts off when removing them if you don't PB blast the hell out of them and take it easy when trying to get the plate off. If the head of the bolt comes off don't freak you should be able to grab whats left of the bolt when you remove the whole unit.
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Old 07-07-2013, 01:55 PM   #7
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Depends on how you drive the Jeep. I have a posilok and love it.
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Old 07-07-2013, 01:58 PM   #8
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no more vac with the lock
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Old 07-07-2013, 02:00 PM   #9
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OR for less than 5 bucks you can just use some washers and pin the shift folk over in the locked position.. might get some vibs if your front shaft is not balanced.
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Old 07-07-2013, 02:08 PM   #10
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I am going to warn you, it's not worth the trouble. I got the posi lock and I'm extremely disappointed. Lock the fork over with washers. Or if you want to buy the kit that locks it over permantly for 50$ The install wasent hard, but it was a pain in the ass. Especially drilling the hole in the fire wall. It was a decent set up for a few weeks and then, it went to hell. I was out one night and the tires started to spin, so I went to lock the shift fork over with the posi lock, and the button came right off the cable. I had to use pliers to get it in. It is in no way worth the 150$
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Old 07-07-2013, 02:12 PM   #11
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This will be 100% easier to install than posi lock. And will never fail you. It's cheaper also

http://www.jeep4x4center.com/alloy-u...ll-451100.html

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