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Vacuum disconnect... of what?


 
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kaos
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Joined: 10 Jan 2006
Location: Iceland

PostPosted: Tue Jan 10, 2006 1:10 pm    Post subject: Vacuum disconnect... of what? Reply with quote

Hi everybody,

I am looking into buying an XJ, and came across your site when looking for some info. And boy, do you have lots of info Very Happy

Anyway, I have seen references to "vacuum disconnect" front axles (and that they should generally be avoided), but was wondering where the disconnection was made? At the hubs?

Also, what do the later, non vacuum disconnect, axles use instead?

Thanks,
Kari in Iceland
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JeepinNH
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Joined: 13 Sep 2005
Location: New Hampshire

PostPosted: Tue Jan 10, 2006 1:29 pm    Post subject: vacuum disco Reply with quote

Iceland, cool. The vacuum disconnect is supposed to make the front wheels free similiar to hub locks. It is located in the rear passenger side of the front axle. It is basically a collar that slides on a spline which locks each side of the axle together. The collar is moved by a vacuum controlled actuater which sometimes sticks open or closed plus you have the potential for a vacuum leak because the hoses are low enough to get hit by sticks. I never had an issue with the one in my truck but I guess other people have. IMO I wouldn't worry about it too much as long as the 4 wheel drive works properly. I'd get one that fits what I can afford and is in good shape, I personally like the 97 and newer. Lots of power on tap. Smile
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Present: 99 Cherokee
Past: 86, 87 Cherokee; 94 Grand Cherokee
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Tue Jan 10, 2006 6:36 pm    Post subject: Reply with quote

The passenger side inner axle shaft is split into two pieces creating a disconnect. As noted earlier, the collar locks these two halves together when the vehicle is put into 4wd. These axles were only used up to 1995 in the XJs. 95+ were non-disco. The non-disconnect axles use a one-piece inner shaft.
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kaos
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Joined: 10 Jan 2006
Location: Iceland

PostPosted: Wed Jan 11, 2006 11:18 am    Post subject: Reply with quote

Ok, thanks for the info.

Kari in Iceland.
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