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I tried using 4wd for the first time on my 94 yj and it doesn't work. When i put it in 4H or 4L the back tires still spin but the front tires don't move at all. You can hear it go into gear but nothing happens. 2wd works great. Any suggestions as to what is wrong?

Thanks!
 

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first check to make sure that you have a front driveshaft..other problems could be the vacuum switch on the transfer case,the vacuum lines or the vacuum actuator on the front axle
 

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There should be a line somewhere near the top of your transfer case that attaches on the upper side above the pinion on your front axle, make sure it isn't cracked or leaking, or simply just replace it.
 
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