what is going on with my 4 wheel drive???? - Jeep Wrangler Forum

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Old 12-16-2012, 10:30 PM   #1
Join Date: Dec 2012
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Question what is going on with my 4 wheel drive????

ok, i have an 89 wrangler 4.2 all stock except it has 33" super swampers on it. lift has not yet been installed, will be installed in spring. But i have been having issues with my 4wd. at first when i almost got stuck off roading i thaught that it wasnt working at all, so i figured it was a vac line, but it wasnt. i put it up on jack stands and both front wheels were spinning when i put it in 4wd? so then i went off roading again and went to flex on a rock and my front wheels wouldnt spin so i couldnt get on it then i got stuck on an un even bump (rear differential is not locked so only one wheel spins) then almost got stuck again. so i got home put it up on jack stands to check it out and 4wd... worked fine? when i was in the trail and when ever i put it in 4wd weather it works or not the gears always get really low like they should when it is in 4wd low. so it seems like it is working and the 4wd light always comes on but when eveer i actually try to use the 4wd in the trail the front wheels dont move. but when i put it on jack stands and their is no pressure or any resistance it works fine. What is going on with my 4wd? when ever i need it it doesnt work? WTF?????

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Old 12-16-2012, 10:49 PM   #2
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Do you have locking hubs?

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Old 12-16-2012, 10:57 PM   #3
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i'd still bet that it is the vac. disconnec t if u have one

its extremely simple to fix if its the vac disco

on my cousins yj we slid the collar so the shafts were connected and put a large zip tie on the shaft that the shift fork mounts to ... effectively semi-permantly connecting the disco

or you can waste money on a cable disco setup

or do the smart thing and swap in a non disco shaft
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Old 12-16-2012, 11:17 PM   #4
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no it does not not have locking hubs. but if it was a vac line why does the 4wd work fine when it is up on stand? caus if it is vac line it wouldnt engage at all right?
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Old 12-17-2012, 11:30 AM   #5
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The 4x4 light is activated by the vacuum lines on that year Wrangler, so even if the light comes on, it doesn't mean the shift motor is locking the shafts.

2.5L Genius of some sort.
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Old 12-17-2012, 11:35 AM   #6
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So if it I my vac lines what is te best way to fix this? I have heard of posilock or products like that? Would that solve the problem or is their a better solution
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Old 12-17-2012, 09:18 PM   #7
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I run a posi-lock on mine (installed be PO) and it works fine. if i personally had to do it, i'd swap for a non-vacuum front axle or just lock it
4:10 = 2.5
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Old 12-17-2012, 10:16 PM   #8
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Posi lock or permanently lock it out. It is in the sticky s at the top of the page. Gut the vacuum system and get something reliable.

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4wd doesnt work , 4wd doesnt work right , help advise , only sometimes works

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