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Old 03-08-2009, 10:53 PM   #1
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4 wheel drive help

I have a 87 yj that the 4 wheel drive does not work. I put the jeep on jackstands and put it in 4 low. The front drive shaft starts turning but the front wheels do not. I noticed that on the front passanger side is a round piece that is bolted to the back of the housing close to the hub. It has vacum lines that seem to run back to the transfer case. Look like they all are pluged in. The part that is bolted to the axle pivots freely about 180 degrees each way you rotate it. Is this normal. First jeep I have ever owned so don"t no much about them, so please use idot words to explain. What would keep the front wheels from engageing. Thanks.

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Old 03-08-2009, 11:13 PM   #2
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All I know is that that thing is called the shift motor

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Old 03-09-2009, 01:07 AM   #3
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does it work in 4wheel high?
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Old 03-09-2009, 01:46 AM   #4
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Dude theres a lock pin that should be there or maybe a Ujoint, I can see it being something extremely easy like my YJ was, damn thing I thought I bent a rod turns out I dented oil pan
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Old 03-09-2009, 02:10 AM   #5
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No it does not work in 4 high. Front drive shaft turns but wheels won't.
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Old 03-09-2009, 05:52 AM   #6
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It could be a couple of things. 1. The vacuum lines could be old, dryrotted, and cracked. This would cause the shift motor not to hold vacuum and not engage the front axle. 2.The shift motor itself could be shot. A new one will run ya $100-150 depending on where you get it.
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Old 03-09-2009, 06:59 AM   #7
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sounds like you have a vacum problem like so many other yj others have had, this should help http://www.wranglerforum.com/f8/how-...ems-17802.html
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Old 03-09-2009, 08:44 PM   #8
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Try this too. I wrote this a little while back. The pics are gone, but it might be useful.

Let me know if I can answer any questions.

http://www.wranglerforum.com/f8/4-wh...s-on-5849.html

I hope this works. I can't remember how to post a link....

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