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4WD kicks out


 
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EagleKeeper
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Joined: 23 Mar 2006
Location: Gettysburg,PA

PostPosted: Thu Mar 23, 2006 8:29 pm    Post subject: 4WD kicks out Reply with quote

Here is the scoop. My 91 Comanche kicks in and out of 4wd. Figured it was the vacuum module on the front axle,so I locked the fork. No help. does it in 4wd low or high. Does it on dry roads,snow,mud. It is very violent when it does it. Bam,Bam. My next shot is to mark the front and rear drivshafts .Drive it and see if they are misaligned upon return. If they are I would guess the transfer case chain is shot. This truck has been used very hard, off road. Any ideas ?

Last edited by EagleKeeper on Fri Mar 24, 2006 2:21 pm; edited 1 time in total
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EagleKeeper
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Joined: 23 Mar 2006
Location: Gettysburg,PA

PostPosted: Fri Mar 24, 2006 2:20 pm    Post subject: Reply with quote

shock Hello !!!!!! Any other mechanics on this forum?
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jppilot61
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Joined: 06 Mar 2004
Location: Tappahannock, VA

PostPosted: Fri Mar 24, 2006 6:24 pm    Post subject: Reply with quote

I have 92 XJ, mine was jumping out of 4Low (but not 4 High). Adjusting linkage was all it took!

Oh Yeah, I sure ain't no mechanic!
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Last edited by jppilot61 on Sat Mar 25, 2006 3:25 am; edited 1 time in total
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Code3TJ
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Joined: 01 Jan 2004
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PostPosted: Fri Mar 24, 2006 8:34 pm    Post subject: Reply with quote

Why are you driving it in 4 anything on dry pavement? Do you have a transfer case drop? If so, I'd also suspect the linkage.
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ThePhantum
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Joined: 23 Jan 2004
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PostPosted: Fri Mar 24, 2006 9:48 pm    Post subject: Reply with quote

When it pops out does it always go to neutral, or does it pop from 4L to N and 4H to 2WD? I'd suspect linkage first. Failing that, you'll have to open the case and inspect the chain, forks, gears and bearings. Any one of them (or a combination) could cause it.
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EagleKeeper
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Joined: 23 Mar 2006
Location: Gettysburg,PA

PostPosted: Thu Mar 30, 2006 1:37 pm    Post subject: 4WD problem Reply with quote

The engagement on dry pavement was only to troubleshoot in a straight line. Little bit easier to concentrate on the problem at hand on a nice level quite road. The indications of this problem are violent and rapid disengagement/re-engagement. Same symptons as a sloppy front axle shift fork. Have checked and adjusted transfer case linkage several times , to no avail. I have a few spare transfer cases in the shop,may just be easier to slave one in and try it. After 220,000 miles I think it may be time for a major teardown anyway. Still has original clutch. Maybe I have enough motormount/crossmember slop that it is causing induced input to the T/C from linkage distortment. Also ,if driven below 10 mph under any conditions,,,,all is well.
horse
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