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Old 06-23-2014, 10:51 AM   #1
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95 YJ-Stuck in 4WD among other probs

So I cannot find a straight answer on these forums concerning my girlfriends YJ being stuck in 4WD. The transfer case shift knob is clearly in 2H. However the vehicles dash light says 4H. It is in fact in 4H. What do we do? I know the YJs have some sort of vacuum 4WD mechanism on the axle that my TJ does not have.

Links to other parts concerning this issue? Personal knowledge? I need learned!

Also completely different and I don't have enough info yet but it stalls as we drive it. Rarely. I'll post pictures and maybe abuild thread however I'm more focused on fixing simple things for now. I'll go more in depth to get an answer for the 4WD soon

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Old 06-23-2014, 11:32 AM   #2
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According to the FSM the light should only be on when the front is receiving the vacuum.
I would check the linkage at the transfer case and make sure it's hooked up, not bent, and is adjusted properly. I'm not home atm but heres a link to a parts manual:

Jeep Information Center, Jeep Parts Catalog, Jeep Repair Manual & More

Go through it and look at the 4x4 system. The vacuum actuator could be stuck open also

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Old 06-23-2014, 12:19 PM   #3
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If it is truly in 4x4 then there are two things going on.

1) the front axle needs vacuum.

2) the t-case shift lever needs to be in 4hi or 4lo.

I am guessing that you are not actually in 2hi. the lever may appear in 2 hi but the linkage could be off or you are not going up high enough. The t-case is a physical connection to the lever via linkage. Where as the front diff is controlled by electronics (more to go wrong). If something was wrong and the front axle is locking up, that should effect if the T-case is sending power to the front axle. You can disconnect the shifter and manually shift the T-case from under the jeep. I would try this first.
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Old 06-23-2014, 02:43 PM   #4
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Thanks already did. The transfer case portion of the lever is in the forward most position meaning 2H. I will post pictures soonin order to see the problem better
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Old 06-23-2014, 02:56 PM   #5
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The pictures of linkage to transfer case. Might help might not. Looks like it's in functioning order to me
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Old 06-23-2014, 03:25 PM   #6
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Does it have power to the front end, or is the front end just engaged at the CAD?
If it is just engaged at the CAD then it's a Vacuum problem, try an switch the hoses at the CAD and see if that's it. check which hose has vacuum, there should only be one at a time.

But one or the other should have vacuum at All Times will the engine is running.
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Old 06-23-2014, 03:28 PM   #7
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I would trace those vacuum lines all the way to the 4wd Actuator on the axle. I had a similar issue with mine and it turned out that the Return vacuum line melted on the exhaust and just needed to patch the line.
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Old 06-24-2014, 06:28 AM   #8
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So how do you know it is truly in 4x4? Have you turned on concrete at the tightest radious possible? That will tell you pretty quickly if it is or not. If it is you will feel the binding of the t-case. There are other methods as well but this is the fastest.

IF it is truly in 4x4 (t-case sending power) and the shifter is in fact all the way up in 2hi. Then you have some problem inside the t-case. But that would also mean you have some problem with the vacuum system also. I find it hard to believe you would have those two problems. I believe the T-case uses the position of the lever to engage the vacuum system on the axle. So it just really seems like that is the problem.

Also, I meant disconnect the T-case shift lever and push the piece that comes of the T-case ALL the way back. I didn't doubt that you had the lever all the way up in 2hi. But if it out of adjustment then that won't do you any good. If you disconnect the shift lever and manually move the linkage to the rear. The shifter pivots on that bolt so when you shift all the way to the front of the Jeep it moves the T-case portion to the rear.
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Old 06-24-2014, 06:58 AM   #9
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What year yj is it? Along with these suggestions some also have vacuum switch near the battery that controls your 4wd light. If your t-case is in 2wd and the CAD is out then this switch may be bad causing the 4wd light to stay on.
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Old 06-24-2014, 04:36 PM   #10
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OK hey guys. The vehicle may not be in 4wd. I turned it tightly and do believe I felt the binding of the tires. The front of the jeep shakes and you can feel the tires create friction against one another. However when I put it in 4Lo the same thing happened but the steering wheel more agressively pulls back and forth.

Thomas S I don't think the linkage is the problem. I don't have another set of eyes with me but the pictures I'll post tomorrow appear to show that the lever on the actual transfer case does go to the rear and all the way to the front (being 4LO).

I also switched the lines at the vacuum on the axle. While I was in 4hi it appeared that both lines were receiving some pressure, but nothing to write home about. I assume that somehow the front axles are locked together because for whatever reason the 4wd light remains on and the tires do move against one another, but it is more aggressive when I actually put the vehicle in 4LO and turn tightly.
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Old 06-24-2014, 06:18 PM   #11
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Ok, sounds like a Vacuum thing, as said before you will need to trace those lines back to the TC and see whats what, I had some of this same crap happening on mine and I pulled all that Junk off and installed a Posi-Lock System. It a Manual Cable to move the CAD in and out. Some on this site like to pull the cover of the CAD and Lock the Yoke in place some how, there's a couple different ways to do it. It would then act just like Hers does. Some Body May have done this to Hers, and that would be why it will not disengage.
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Old 06-24-2014, 06:38 PM   #12
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I locked the fork over in the CAD,all it takes is a bushing to do it.there are several writeups on how to do it.my light was staying on all the time ,the problem had nothing to do w/it being in or out of 4wd.I was'nt sure last winter if my 2wd/4wd was working so I put all 4wheels on jack stands and started it up and ran the transfer case through the 3 choices.if it's in 2wd fronts won't move,4wd fronts move....russ
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Old 06-25-2014, 07:40 AM   #13
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I think we need to separate these issues. Even if the vacuum disconnect is messed up and locking the front axle in when it shouldn't be, the front axle should not be receiving power when in 2hi.

I know it may look like the lever is all the way back but it may need to go further back. I will crawl under my Jeep when I get home and take a pic. We can compare position.
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Old 06-25-2014, 10:12 AM   #14
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Thanks guys. Like I said from what I can see the 4wd shifter appears to be working. Because of my inexperience with the yj I'm led to believe it's the vacuum but who knows. As soon as I can I'll post pictures of the linkage in every position and when I get more jack stands I'll put it up and test it in all positions
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Old 06-25-2014, 11:58 AM   #15
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You should be able to spin the front drive shaft with all 4 tires on the ground. If you can't then either the T-case is in 4x4 or the axle vacuum is engaged or both. Although, i'm not sure if the axle stays engaged when the Jeep is turned off...
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Old 06-25-2014, 04:31 PM   #16
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So leave the Jeep on in neutral and then spin the driveshift correct? As soon as I have a chance I will take a look at it but it's been raining and had some of our other vehicles went down. Give me a couple days until I have some time with it
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Old 06-25-2014, 05:00 PM   #17
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Those pnumatic actuators always go out and cause problems, time to convert it to a manual pull cable
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Old 06-25-2014, 05:13 PM   #18
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Quote:
Originally Posted by MkUltraOps View Post
Those pnumatic actuators always go out and cause problems, time to convert it to a manual pull cable
That's what I did, but it may not be the best way for his GF, it take a little training on how to Operate.
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Old 06-25-2014, 07:53 PM   #19
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That's what I did, but it may not be the best way for his GF, it take a little training on how to Operate.
true.
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Old 06-27-2014, 08:01 PM   #20
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Here are some random pictures of condition of the same yj. Rusty in the frame, uncovered gearing to the transmission
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Old 06-27-2014, 08:06 PM   #21
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Here it is
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Old 06-27-2014, 08:09 PM   #22
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Hey now. As jessepalmy's girl, I can handle a simple posi-lock! Lol
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Old 06-27-2014, 08:12 PM   #23
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Here is 4wd in 2LO neutral, 4H And 2H
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Old 06-27-2014, 08:18 PM   #24
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I couldn't get the vehicle up on all fours because the rear frame was so rusted I almost tore the bumper off. However this is not the point of this thread. I could not rotate the front wheels with the drive shaft while the front two were were up. That's with it being in 2H.
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Old 06-27-2014, 08:20 PM   #25
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I will disconnect the linkage and manually shift it when I get a chance
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Old 06-28-2014, 06:46 PM   #26
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Wow, to me 4Hi and 2Hi look the same spot.
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Old 06-29-2014, 12:55 AM   #27
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Quote:
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So how do you know it is truly in 4x4? Have you turned on concrete at the tightest radious possible? That will tell you pretty quickly if it is or not. If it is you will feel the binding of the t-case. There are other methods as well but this is the fastest.
sorry to go back a bit but can this "binding" be hurtful to the t-case? Like if you were to do it too often, etc.
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Old 06-30-2014, 07:03 AM   #28
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Yes, it can stretch the T-case chain.
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Old 06-30-2014, 07:17 AM   #29
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I quickly read through the post so forgive me if you have already done this, I'm a new jeep owner and had this issue with my 93 YJ and had my next door neighbor pull it out of 4H. All he did was shift to 4H forward and back shift to 4L forward and back then back to 2H back. that pulled it out of 4H.
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Old 06-30-2014, 11:12 AM   #30
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I quickly read through the post so forgive me if you have already done this, I'm a new jeep owner and had this issue with my 93 YJ and had my next door neighbor pull it out of 4H. All he did was shift to 4H forward and back shift to 4L forward and back then back to 2H back. that pulled it out of 4H.
my '95 needs this done to it occasionally too. All I have to do is wiggle it around a bit and put it into gears. XD

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