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Unread 08-17-2013, 09:44 PM   #1
93zjgrand
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dana 30 with vacuum disconnect, what is it

ok, what is vacuum disconnect on a dana 30 and what does it do and what is its purpose

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Unread 08-17-2013, 09:46 PM   #2
93zjgrand
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and how o tell if i had one
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Unread 08-17-2013, 10:13 PM   #3
dnuccio
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ZJ never had a vacuum disconnect axle.

its an actuator on the passenger side axle tube operated by vacuum. it disconnects the axle shaft from the rest of the axle. i dont know exactly what the purpose is, but i believe its supposed to act similar to manual locking hubs.
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Unread 08-17-2013, 10:25 PM   #4
Mickey_D
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And it was only used on older generation XJ Cherokees.
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Unread 08-18-2013, 08:06 AM   #5
dnuccio
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Quote:
Originally Posted by Mickey_D View Post
And it was only used on older generation XJ Cherokees.
and didnt some YJs have it too?
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Unread 08-18-2013, 08:08 AM   #6
Anticanman
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Quote:
Originally Posted by dnuccio View Post
and didnt some YJs have it too?
All YJ's came with it.
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Unread 08-18-2013, 11:35 AM   #7
Mickey_D
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Originally Posted by Anticanman View Post
All YJ's came with it.
That I did not know. Huh, learn something new every day.
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Unread 08-18-2013, 11:39 AM   #8
dnuccio
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Quote:
Originally Posted by Anticanman View Post
All YJ's came with it.
another reason im glad i got a ZJ
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Unread 08-18-2013, 11:45 AM   #9
OverlandZJ
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Some guys do like them, it's HP and the housing is stronger at the pass side upper CA mount. You also gain the option for 2wd low.

Upgrade to the cable action and HD shift fork.

However, most are the 260 ujoint
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Unread 08-18-2013, 01:00 PM   #10
Anticanman
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The cad system isn't a big deal. Its high pinion and takes about ten minutes to turn into a solid shaft. There are a high number of xj's that have the larger ujoints but swapping shafts isn't a big deal either. I run solid shafts in my Yj disco housing and haven't had a problem until I needed a truss. I should probably upgrade to a stronger axle but mine is holding up just fine locked on 36's offroad. I also dd my jeep on 35's.
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