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Old 04-13-2009, 06:19 PM   #1
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No 4WD!!??

I'm fairly new to this site, been reading - no posting. Anyway, I have a '93 YJ - with a '95 2.5, 5spd. I am not able to get 4wd to work. I thought it wasn't working (haven't had to use it, really), but had to remove rear driveshaft - to replace u-joints, & engaged 4hi, just to check & Jeep will roll forward when pushed. It has a Posi-Lok for front axle engagement & 4WD light comes on. Transfer case shifts fine into 4hi. Should it be able to roll freely or what could be wrong? Any help/advice would be greatly appreciated.

Thanks..
lokitim

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Old 04-13-2009, 06:38 PM   #2
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First of all, if 4high or 4 low are engaged in the transfer case, both driveshafts should turn (transmission in neutral) as if they are locked together. To test this, they need to both be disconnected from the axles, or all four wheels off the ground, & on safety stands.

The front axle, (open ended diff) can be checked itself to see if the axle shaft is locking.

Jack up the passenger side of the front axle & put a jackstand under the axle.

Have someone hold the front driveshaft still. Now the drivers side is still on the ground, & try to turn the passenger wheel. It should turn when not engaged, But not turn when the internally splined collar is engaging both the center axle shaft & the passenger side axle shaft.

Again for this test to work the drivers front wheel and the front driveshaft must be held still.

So the answer to your question, is if both front wheels are on the ground,
and the front axle is actually locked at the disconnect, & the transfer case is engaged in 4WD then you shouldn't be able to push the jeep more than a 1/2" or so.

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Old 04-13-2009, 07:00 PM   #3
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If I check as you say & it still doesn't work, what could be wrong?
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Old 04-13-2009, 08:08 PM   #4
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Quote:
Originally Posted by lokitim59 View Post
If I check as you say & it still doesn't work, what could be wrong?
If the front axle disconnect is functioning properly, that would leave the transfer case.

Unless, (just thought of this) something is broken in the front differential. This could be checked by jacking both front wheels up & on stands, then turn front driveshaft by hand (transfer case in neutral) & see if one tire up front turns.
If it does, have someone hold that still while you turn the drive shaft again. If the other wheel turns. Then the diff is probably OK if you didn't hear any crunching sounds.

If the transfer case doesn't lock both drive shafts together, when in 4WD then it's something internal in the transfer case.

Your options then would be to take it down & either open it up to see if you can find something wrong, or replace it with a new (very expensive) or used/rebuilt unit.

If you look in there & find something broken, then you'll have to decide whether it's worth fixing.
(post pics)

Before you do anything, you should check that the posi-lok cable is actually engaging the collar in the axle.
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Old 04-13-2009, 10:04 PM   #5
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I got a posi lok cable and i have to turn the button tell you feel it get tight before mine locks in! not sure why but i have to twist it to lock it ,try that!You can feel the cable get real tight.
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Old 04-14-2009, 06:11 AM   #6
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For both of you I would suggest going over the adjustment procedure of the posi-lok cable. Adjustment is key to having it work properly.

YJ Axle Locker Installation

You have to read down a ways, but it's saying the cable housing needs to be threaded in enough, that pushing the knob all the way in will disengage the front axle halves without the C-clip bottoming out.
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Old 04-14-2009, 09:14 AM   #7
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Thanks YBURN, I did find out I had to twist the POSI-LOK for it to engage. (felt real stupid!). And thanks, BUCKSHOT, I will go over the adjustment procedure.
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Old 04-14-2009, 05:38 PM   #8
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Sometimes even a posi-lok cable deal is hard to engage or disengage.

I usually get it to go in, by doing some slow "S" turns while pulling or pushing on the knob. You don't want to use the twist feature of the knob to apply too much pressure on the fork, it might break.
After it goes where I want it, then I twist the knob to take out the slack, not much more.

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