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Unread 12-03-2010, 07:44 PM   #1
Phil12
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1990 XJ Cherokee 
 
Join Date: Aug 2010
Location: Penngrove
Posts: 136
Transfer case vacuum diagram?

I have looked all over here and on the general internet with no luck, DOES ANYONE HAVE A VACUUM DIAGRAM FOR A 1990 WITH A NP231 T/C? I find diagrams that show a switch on the front differential but as near as I can tell that does not apply.

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Unread 12-04-2010, 12:55 AM   #2
kabowabo
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1988 MJ Comanche 
 
Join Date: Aug 2009
Location: , NC
Posts: 407
Try this one...

http://www.jeepforum.com/forum/f11/i...oblems-546281/
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Unread 12-04-2010, 04:53 AM   #3
cruiser54
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1990 MJ Comanche 
 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 9,811
The vacuum switch is for the light and is mounted up under your coolant bottle.
There is a vacuum operated servo on the rear side of the front diff to engage/disengage the front axle.

My suggestion is this. The system was unreliable. It left many people without 4wd when they needed it most. In 1991 I believe the system was discontinued and they left the axle engaged all the time. Your fuel mileage will not suffer having it engaged all the time.

The axle can be permanently engaged and fixed forever with 1/2 hours work. No parts needed.
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Unread 12-04-2010, 02:36 PM   #4
kabowabo
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1988 MJ Comanche 
 
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Location: , NC
Posts: 407
X2. I dumped mine and installed a mid 90s D30. Non disco and a little more modern brakes.
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