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Old 02-17-2013, 10:55 PM   #1
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4 wheel drive problems

I have a 88 yj and I'm having problems with it jumping out of 4wheel drive I somewhat know about the vacuum lines but not sure what to do. I thought I could put manual lockers on and bypass the vacuum stuff but I don't want to spend a fortune and I heard that's expensive. Anyone had any trouble with the same thing

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Old 02-17-2013, 11:06 PM   #2
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You can remove the vacuum operated system and install a cable operation to control the front axle, or just lock the axle just as the TJ operates.

Posi-Lok PSL900 - 4x4 Posi-Lok for 84-95 Jeep® Wrangler YJ, Cherokee XJ & Comanche MJ - Quadratec

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Old 02-18-2013, 07:32 AM   #3
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How would you go about locking it in like the tjs. If I put in the posi would that fix the shifter from jumping out of gear
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Old 02-18-2013, 11:01 AM   #4
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You can permanently lock the collar over with washers or a spacer, or you can install a posi lok cable. If you intend to run a locker, the cable will allow you to disengage the right front wheel to make tighter turns. My YJ is set up like this and it works beautifully.
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Old 02-18-2013, 11:13 AM   #5
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what is jumping out of gear? the axle? transfercase? tranny? you need to be more specific.
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Old 02-18-2013, 04:37 PM   #6
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Ok here is what happens. It's a manual 5 speed I put the gear shifter in neutral and move the 4wheel drive shifter to 4 wheel hi and it will stay but easily clicks out. when I move it to 4lo it doesn't stay in four wheel drive. I can hold the shifter in place. Does the vacuum actual hold it in or is that mechanical problems
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Old 02-19-2013, 10:10 AM   #7
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In 4HI, does the transfer case shift lever jump back to 2WD or is the 4WD light merely going out?

When you hold the shifter in 4LO, Are you holding it because the shifter will not stay in place, or are you holding it to keep the 4WD light on?

Details, man...
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Old 02-19-2013, 10:21 AM   #8
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It sounds like your transfer case linkage needs to be adjusted.
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Old 02-20-2013, 10:49 PM   #9
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The lights don't work it's to just keep it in 4 wheel drive it just jumps out
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Old 02-20-2013, 10:51 PM   #10
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I hold it to keep it in 4wheel drive when I let go it moves back into 2 wheel drive
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Old 02-20-2013, 11:02 PM   #11
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I'm curious because I'm wondering if it could be the vacuum pump has gone bad. I'm not sure if something was wrong with the vacuum system not locking in the fork in the front chunk if it would make it not go in four wheel drive. I guess I'm saying if the vacuum goes out will it jump out of gear or is that the linkage. I'm working on getting the parts together to install the locking cable for the front drive shaft fork. ?????
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Old 02-20-2013, 11:22 PM   #12
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The vacuum disconnect will not make the transfer case jump out of gear. You need to adjust the linkage. It's not fully engaging in 4 low and pushing itself out of gear. Loosen the pinch bolt on the linkage, put the transfer case in 4 low using the lever at the case, adjust the linkage so there's about an eighth inch gap between the shifter and the back of the shift gate, and tighten the pinch bolt back up.
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Old 02-21-2013, 10:36 AM   #13
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Quote:
Originally Posted by Tyewilly View Post
The vacuum disconnect will not make the transfer case jump out of gear. You need to adjust the linkage. It's not fully engaging in 4 low and pushing itself out of gear. Loosen the pinch bolt on the linkage, put the transfer case in 4 low using the lever at the case, adjust the linkage so there's about an eighth inch gap between the shifter and the back of the shift gate, and tighten the pinch bolt back up.
THIS.

If it is jumping out of 4HI back into 2HI, can you put the tcase in neutral? 4LO?

The front axle is a whole seperate issue. Once you get the tcase shifting properly, you can determine if you are having vacuum actuator problems.
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Old 02-21-2013, 10:29 PM   #14
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It will go in neutral as well but when I try to put it in 4 lo it moves back into neutral. I'm a little hesitant about adjusting the linkage bc I don't know that much about it but I can give it a try I couldn't make it any worse I wouldn't think. I have a lift ordered and some new 33s bfs I want to put on it should raise it up 4" I am thinking ill have to adjust the transfer case after the lift as well.
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Old 02-22-2013, 08:37 PM   #15
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It would be easy if I could take the skid plate off but I think that's the only thing holding the transmission. I tried dropping it and I'm pretty sure that's the case. Am I wrong

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