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Unread 10-30-2013, 12:23 PM   #1
dechant91
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Join Date: Apr 2013
Posts: 21
4wd not engaging

I recently bought a 92 yj with a np231 tcase. I decided the other day to see what it had in 2wd and snapped my rear slip yoke in half. I then dropped it into 4wd to try and get out of where I was and limp home and no movement. I climbed under neath and took a look and saw that the front drive shaft was fully intact with the axle and was spinning but was not making connection with the tires. I haven't done much work with axles but am pretty tech savy when it comes to my vehicles and would like to fix this issue while I'm waiting on my new slip yoke. If anyone has any ideas on what it may be please let me know.

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Unread 10-30-2013, 10:52 PM   #2
GrouchyTim
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1988 YJ Wrangler 
 
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Well knowing that you have a YJ and therefore have a CAD axle would make you savvy. Your vacuum actuator or the vacuum switch at the Tcase or possibly the vacuum lines to either or both are faulty. Start with checking the vacuum lines where they pass over the exhaust. They may have come in contact with the exhaust pipe and burned through. Fix as necessary. If they are ok then move to the actuator on the passenger side axle tube. Make sure it moves like it should. Last, I'd try the switch on the driver side of the Tcase. It's got 4 vacuum lines going to it. It needs to work for you to engage your front axle.
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Unread 11-03-2013, 12:32 PM   #3
dechant91
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Awesome I appreciate the help. I took a look at my lines switch and the sift motor on my cad and everything seems to be in pretty good shape. I read on wrangler forum that there is a solution to make the cad axle a solid axle by putting a spring inside the fork of the sift motor they say this will fix the problem without needing the vaccum lines anymore. Thus being able to plug them and be able to shift freely in 4wd hi and lo. Has anyone heard of this remedy I'm thinking about doing it but skeptical because they say you may get a bumpy ride from your front axle. I do not want to mess something up in my front end from doing a quick solution. Any advice is greatly appreciated.
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Unread 11-03-2013, 08:54 PM   #4
cruiser54
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1990 MJ Comanche 
 
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Location: Prescott, Arizona
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Quote:
Originally Posted by dechant91 View Post
Awesome I appreciate the help. I took a look at my lines switch and the sift motor on my cad and everything seems to be in pretty good shape. I read on wrangler forum that there is a solution to make the cad axle a solid axle by putting a spring inside the fork of the sift motor they say this will fix the problem without needing the vaccum lines anymore. Thus being able to plug them and be able to shift freely in 4wd hi and lo. Has anyone heard of this remedy I'm thinking about doing it but skeptical because they say you may get a bumpy ride from your front axle. I do not want to mess something up in my front end from doing a quick solution. Any advice is greatly appreciated.


http://comancheclub.com/topic/17377-cad-fix-1/
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Unread 11-04-2013, 06:48 AM   #5
dechant91
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Thanks for the link cruiser I like that method a lot better than shoving a spring in there lol. And that answered the question nobody seemed to want to about if its all time 4wd thanks again.
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