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Old 03-27-2012, 11:53 PM   #1
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1995 Wrangle 4WD-HI problem

I have a 1995 Wrangler and it shifts into 4wd-hi only the rear wheels spin. It also engages 4WD-L and 4wd works.
Also, the 4WD indicator on the dashboard does not light up for hi and low.

I was thinking that the transfer case is not the problem, because 4WD works on low and maybe it is the sending unit or the vacuum actuator switch on the diff.

Did anyone ran into this issue before and can anyone recommend a fix?

Thanks for any help.

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Old 03-28-2012, 07:49 PM   #2
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Please help!

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Old 03-28-2012, 10:09 PM   #3
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The same actuator on the front does 4Hi and 4Lo, so if 4Lo works it should not be that.
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Old 03-28-2012, 10:11 PM   #4
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are the front wheels pulling when in 4lo?
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Old 03-28-2012, 10:41 PM   #5
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Quote:
Originally Posted by 4Jeepn View Post
are the front wheels pulling when in 4lo?
Yes, all wheels are engaged when in 4lo.
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Old 03-28-2012, 11:42 PM   #6
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From what I've read in this thread , with what is working, and when, I would have to say it's something with your transfer case. As posted above, it's the same actuator and vacuum line that engages the front axle, if it works in 4lo, than it should work in 4hi(the actuator at least). If you can jack up all four wheels at the same time(jack stands), put it in 4hi and see if the front driveshaft spins. If it doesn't spin in 4hi, but does spin in 4lo.... Then it's your case. Good luck!

Edit:
Your indicator light may just be burned out, especially if you're sure the front engages at all(lo or hi)
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Old 03-29-2012, 10:43 PM   #7
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Thanks for the inputs!
I will try to jack up the jeep and checking 4wd. I tryed just engaging 4wd-hi but only the rear wheels spin. In 4WD-lo it feels like all 4 are engaged.
I also want to check the vacuum hoses to the front differential switch. Is there any other electrical controls that might be causing this?
If it is was the transfer case, could be be fixed or should i replace it?
Thank you!
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Old 03-30-2012, 07:22 AM   #8
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With the engine running in 2wd you should have vacuum to the passenger side line at the actuator. In 4wd you should have vacuum to the drivers side line.
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Old 03-30-2012, 11:46 AM   #9
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Can be the "vac. switch" on the Transfer case, and not the case it self.
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Old 03-30-2012, 08:30 PM   #10
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i found the problem! the vac um hose was disconnected from the intake manifold. Works great now!
Apparently those vacuum hoses get old and dry up and get loose, but they are very easy to follow.
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Old 05-14-2012, 09:30 PM   #11
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You mind posting a pic of where the vacuum was connected to the intake?

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