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post #1 of (permalink) Old 03-09-2001, 08:39 AM
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Front axle vac. harness??

I need to replace the vac. harness for the axle disconnect. I was wondering if they made it out of the hard plastic for a reason. If there isn't a reason for it I was thinking about making my own harness out of regular vac. tubing. Any advice or input is appreciated.
Thanks
Ed
89 Yj 4.2 weber tf999

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post #2 of (permalink) Old 03-09-2001, 09:06 AM
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Re: Front axle vac. harness??

My guess would be that they used the hard line to prevent the line from collapsing like the soft line could with enough vacume applied to it.[img]/wwwthreads_images/icons/cool.gif[/img]

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post #3 of (permalink) Old 03-09-2001, 09:18 AM
 
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Re: Front axle vac. harness??

i know that 4wd now makes a cable conversion for the vac axles i think its called posi lock i read about it in jp magazine instead of relying on vacuum you just pull the handle and the axle is locked in

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post #4 of (permalink) Old 03-09-2001, 09:33 AM
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Re: Front axle vac. harness??

The same article also said you could do the same thing as the Posi-Loc for about $20 worth of parts from any tractor supply house. But, as usual, they stopped there without giving a better discription.


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post #5 of (permalink) Old 03-09-2001, 11:21 AM
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Re: Front axle vac. harness??

Well, you can, but depending on how much your time is worth to you, you MAY just be better off buying one. I spent about 7-8 hours total on mine (when I had the 30 up front) and never did get it quite right. The hard part about it is that inside that little vaccum buld on the shifter mechanism is a baffle attached to two disks. I cut out the rubber baffle (getting the bulb apart took some effort in itself) and drilled a hole in the disks. That was a chore in itself, too because the disks spin separate from one another and the drill needs to go through both. If I had a drill press this may have been easier. I broke 3 drill bits doing this.

I attached the skinny end of the cable to the disks with two cable stops and attached the actuator mechanism to the dash with an angle bracket. It looks pretty good, but did not work all that well. I was able to get it to engage nicely, but not disengage without some massaging.

All in all, the time I spent on it could have been better spent elsewhere.

That's just my opinion, though... I could be wrong.

Matt Abbott
90 YJ "Mangler" with TPI 305 Chevy/ SM465/ Dana20 SOA on Scout Dana44's on 35" BFG MT's
post #6 of (permalink) Old 03-09-2001, 12:52 PM
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Re: Front axle vac. harness??

Those vacume lines are a b!tch. I'm going to reroute mine so it connects/disconnects independently of the xfer case shifter. I got some new tubing and will use the one way valve to make it work. For the switch, I am using a 3way vacume switch for a fish tank. Total cost~$10 for everything. Won't finish it though until I get my leaky head gasket problem solved.

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post #7 of (permalink) Old 03-09-2001, 05:02 PM
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Re: Front axle vac. harness??

My suggestion to you is to go to your Jeep dealer and order one. They only cost about $30 bucks and it's complete. This will save you a lot of BS and headaches when trying to figure out what goes where. Very simple set up to set up. If you need help with a diagram of the vaccuum, let me know.
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post #8 of (permalink) Old 03-11-2001, 11:02 AM
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Re: Front axle vac. harness??

I'll take a copy of the vacuum diagram. I have an 89 YJ which I just bought a new vacuum harness for. The old one is just remnants and I am having trouble figuring this out. Thanks

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