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Old 08-13-2013, 06:22 PM   #1
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question on 4x4 and tranny

So I broke my rear u joint mudding the other weekend. We were about 2 miles from camp and I just figured I could throw it in 4h or 4L and drive it off the front drivetrain. (After I took off the whole rear drive train). However my 4h or 4l wouldn't engage after i took it off. Now I'm still pretty new to jeeps. But would/should have this worked? If it should have why did it not? Now it did drain all of the tranny fluid after I took it off...would that be a reason? Any suggestions would be much appreciatted.

92 yj 4.0

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Old 08-13-2013, 06:51 PM   #2
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What did you remove?

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Old 08-13-2013, 06:56 PM   #3
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With a slip yoke tcase the fluid pours out when you remove the drive shaft. A water bottle or 20oz pop bottle duct taped to the tail housing is a good trail fix.
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Old 08-13-2013, 07:08 PM   #4
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Rear driveline was removed and thought front driveline would engage. Does a front 4x4 actuator that runs on vacuum control the tcase? And if it does what is the best way to troubleshoot?
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Old 08-13-2013, 10:37 PM   #5
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the vacuum actuator is on the front axle itself, controlled by a vacuum switch on the transfer case
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Old 08-14-2013, 07:47 AM   #6
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Quote:
Originally Posted by kope21 View Post
Rear driveline was removed and thought front driveline would engage. Does a front 4x4 actuator that runs on vacuum control the tcase? And if it does what is the best way to troubleshoot?
It's possible your vaccum switch is crapped out. Does the 4x4 light turn on when you engage it into 4Hi or 4Lo?
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Old 08-14-2013, 09:56 AM   #7
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You cant drive your Jeep. If you have no rear driveshaft you need to park it until you replace your UJoint and put your driveshaft back in. Without fluid you will cause a major failure of bearings in your TC pretty quickly. When you fill it just get high mileage ATF.

In regards to the 4X4, the light is not always reliable either. Pull the vacuum line off of the front axle (pay attention the the way it is facing so you put it back on right) and make sure you have suction on one side of it. Then shift into 4x4, the suction should switch sides. If it doesn't it is a vacuum line failure, if it does it is a failure inside the CAD housing.

For a vacuum line failure trace the line back to see where it went wrong. A quick and cheap fix for your CAD if that is the problem is a can of brake cleaner. Take out the 4 bolts, remove the fork and spray out the vacuum actuator and things real good. Sometimes gunk gets in there and causes them to fail so clean it real good. Dont get brake cleaner in the axle though.

And no matter what you do, never drive your Jeep very far at all without fluid in the TC. Especially more then just off the trail.
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Old 08-14-2013, 08:31 PM   #8
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You can too drive the jeep with no rear driveshaft using the method I stated a few posts up. It's a good trick and I've seen it in action for 3+ months on a friends yj in high school..
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Old 08-14-2013, 08:46 PM   #9
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You can too drive the jeep with no rear driveshaft using the method I stated a few posts up. It's a good trick and I've seen it in action for 3+ months on a friends yj in high school..
Yeah you can with a bottle, but you can't without fluid. If the op already had a empty tc he should not fill it until he replaces the ujoint. Not put a bottle on it and fill it. You could, but it would make no sense for a $20 part that takes 10 min to replace.

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