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Jeep: Problem shifting into 4WD


John Bruner's Avatar
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06-05-03, 01:43 PM   #1  
John Bruner
Jeep: Problem shifting into 4WD

I have a 1991 Jeep Wrangler w/ the small 4 cyl engine.

This past winter, a problem shifting into 4WD began. At first it was intermittent. Later, it was constant, but would shift into 4WD when vehicle got to 30mph. Finally, it wouldn't shift out of 2WD at all.

My son had the transfer case out at school and apparently it operated fine on the bench. His teacher concluded that it was probably a vacuum problem, but they couldn't find it. I have looked the engine over for leaks or disconnected vacuum lines and everything looks OK.

My question is: Has anyone installed a mechanical means of doing what the vacuum actuator is supposed to do... like a cable to the dash? I'm hoping there is a kit I can buy for this.

 
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06-05-03, 06:18 PM   #2  
Joe_F
Why? There is likely a vacuum switch or actuator that turns on the 4WD.

Call any Chrysler dealer and ask, or look in autolibrary.org below.

 
darrell McCoy's Avatar
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06-05-03, 07:23 PM   #3  
darrell McCoy
Seems some used a "Shift motor" mounted on the front differential and if I remember correctly it is vac controled. For curiousity You might check there. Probably about 2" in diameter. Would only be one hose. As Joe sez, dealer would show you what kind or where controls would be.

 
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06-06-03, 03:15 AM   #4  
I have seen those for the NP23x, 24x, 27x, cases. I only know one guy who used one, but he really liked it, he had it on a S-10 ZR2 it made him a believer. I will do some checking and see if I can find out the one he used and if there are any others.

 
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06-06-03, 05:53 AM   #5  
Joe_F
Original poster: Check autolibrary.org for any help there. I know there is a vacuum or electrically activated motor that shifts into 4WD. These get old and lazy. Sometimes they can be dismantled and cleaned to restore service (Fords come to mind with this).

If the 4WD is used infrequently, the brushes on many actuation motors gets glazed.

 
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