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Unread 05-29-2012, 08:37 PM   #1
01roadking
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1992 YJ Wrangler 
 
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vacuum to engage 4 wheel drive

I am sure you have been asked this many times, but is there a easy way to see if the vacume shifter on a 92 wrangler is working. Is there a schematic that shows how the electric and vacume are to be connected and how they make the connection when the transfer case is shifted into 4 wheel.
Thanks

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Unread 05-29-2012, 08:47 PM   #2
Old4X
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Put it on jack stands and test it out. You will know real quick if the front is locking or not.
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Unread 05-29-2012, 08:51 PM   #3
4x4JB
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I'm pretty sure I have seen someone say put it in 4x4 then put the front on jack stands. Then turn one tire and if the other moves it's engaged.

Just to beat canman to the punch. I'll go ahead and recommend locking the fork over. Really simple and you won't hve to worry about vacuum engaging or not. Do a search for all the details though. Good luck
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Unread 05-29-2012, 09:10 PM   #4
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You really only have to put one wheel in the air. If it doesn't turn then the axle is locked.
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Unread 05-29-2012, 09:48 PM   #5
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http://www.jeepforum.com/forum/f12/h...-hubs-1308217/
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Unread 05-29-2012, 09:55 PM   #6
Anticanman
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Quote:
Originally Posted by 4x4JB View Post
I'm pretty sure I have seen someone say put it in 4x4 then put the front on jack stands. Then turn one tire and if the other moves it's engaged.

Just to beat canman to the punch. I'll go ahead and recommend locking the fork over. Really simple and you won't hve to worry about vacuum engaging or not. Do a search for all the details though. Good luck
I wasn't going to post at all but since you called me out.
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Unread 06-06-2012, 04:03 PM   #7
01roadking
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Thanks for info. jacked up one front tire, in 4 wheel the tire might turn 3 or 4 revs and then lock. Turn the tire the other direction and it might turn and not lock or it might lock after a few turns. but when testing on the hill the front does not lock.> Is the 4-wheel sensor on the front axle, meaning if the lights for 4-wheel come on, it is getting vacume??
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Unread 06-06-2012, 08:18 PM   #8
Anticanman
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The vacuum systems fail. It's best to open up the Central Axle Disconnect located on the passenger side of the axle and lock the fork over with the eclip configuration pictured above. It's fast, free and completely reversible. It will solve your problem once and for all.
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Unread 06-06-2012, 09:14 PM   #9
01roadking
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Once you lock the fork over you then have to install free wheeling hubs, correct? Or, if the fork is locked in the 4-wheel position that would mean the front wheels would be locked together and the front drive shaft would allways be turning, even though the transfer is not engaged? I removed the fork housing today and the fork moves slowly when I shift from 4-wheel to rear only. meaning the vacume system seems to work. But when testing on a gravel hill the front tires do not spin in 4-wheel. With the left front off the ground it seems to lock in, but I do not feel it is a hard enough engagement to not slip out when under load?? Could there be another problem? I thank you for any help you can give me!
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Unread 06-06-2012, 09:19 PM   #10
Anticanman
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You may have to get your driveline balanced, which isnt a big deal. Switching over the hubs on the other hand is quite a financial commitment.
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