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Unread 02-08-2013, 12:56 PM   #1
JohnOllen
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Posi loc not fully engaging

Installed a Rugged Ridge posi loc in my 92 YJ and now the sliding collar which the fork moves over is not reliably locking the front axles together. It's definitely that the locking collar is not slidding over far enough to fully lock the front axles together. Sometimes it does engage and stays for quite a while but will pop out when I'm plowing snow and going back and forth. Sometimes when it pops out I can hear the sliding collar clicking as it almost engages the other axle. Strange thing is I have adjusted the cable so that the fork is as far over towards the drivers side as it can go (actually touches the housing) and it still won't consistently engage? Almost like my axle splines are little worn or the fork isn't allowed to move far enough. I did purchase a new fork with the posi just to avoid any wear issues. New fork looks same as my old. Before I did the swap my vacuum engagement was working, just would freeze up sometimes and take a while to engage so I thought this would be more reliable. Now with 3ft of snow in the driveway I'm very disappointed in the posi loc. Hopefully just a simple adjustment is required. Anyone been through this?

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Unread 02-08-2013, 01:17 PM   #2
jrmboat
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I don't remember exactly but isn't the fork offset to one side a little bit? Is it possible that the fork is reversed so the collar isn't moving over all the way?
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Unread 02-08-2013, 01:23 PM   #3
Mark05059
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why not just move one of the eclips inside and lock it for good.
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Unread 02-08-2013, 01:24 PM   #4
JohnOllen
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Could be I have the fork in backwards but I have it so that the bend in the fork is such that the collar is more towards the drivers side and by my thinking is allowing the collar to be as close to the drivers side axle as possible. Had a look at the haynes manual and the instructions that came with the posi loc and think having the bend towards the drivers side is correct.
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Unread 02-08-2013, 01:26 PM   #5
JohnOllen
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ya, if I can't get this working I'll reinstall my old vacuum housing and fork arrange and lock it permanently as you suggest. pain it the butt though when the sun comes out and dry roads return.
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Unread 02-08-2013, 01:29 PM   #6
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Quote:
Originally Posted by Mark05059 View Post
why not just move one of the eclips inside and lock it for good.
Bingo...
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Unread 02-09-2013, 09:25 PM   #7
JohnOllen
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Got it working, barely. Fork just could not slide collar over far enough to completely lock the two axle shafts. It looks like it should slide a full half inch further than it can to completely center the collar between the axles and really lock the shafts together. I had to grind some off the fork and remove a c-clip which allowed the fork (and collar) to slide about an 1/8 inch further, which turned out to be just enough to engage he 4wd. I had the same issue with the vacuum setup and I had put the CAD on reversed to get it to work. Thought it was just a worn fork and that posi loc and a new fork would solve it. Now wondering if there's a way to adjust the two axles, to bring the gap between them towards the passenger side a bit.
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Unread 02-10-2013, 09:25 PM   #8
JohnOllen
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The saga continues. The 4x4 was working well enough after I did the above work on the fork, at least it was good enough at slow speeds to plow the snow but when I took it out on the highway and hit drier sections where I could accelerate I could feel it tend to pop out of 4 wheel drive every once in a while. Not a good feeling and probably hard on the collar and axle splines. So enough is enough. For whatever reason the way my CAD and axles line up the collar just cannot slide over far enough to solidly engage the intermediate shaft. As I said above I had the same issue with the vac system so something"s not to factory specs, maybe my axle seals are worn although there isn't much space between the intermediate axle and the passenger side axle. Anyways I finallly decided to move the enitre CAD over towards the drivers side. Had to drill new holes in my new posi-loc housing. Make up a thin plate because now the gasket does not sit entirely between the CAD housing and the axle mating surface. This should allow the collar to move a good 1/4 inch further towards the drivers side. Have run out of time tonight so will finish the job up tomorrow night and see if it works.
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Unread 02-10-2013, 10:32 PM   #9
hypernoodle
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Dumb question, but did you try turning the knob behind the button counterclockwise after engaging? It pulls the cable more.
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Unread 02-10-2013, 10:43 PM   #10
mustanggarage
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If I remember correctly you can adjust the posi lock cable by twisting the black nurled knob around the red button. that basically screws the housing out away from the dash anchor and shortens the cable. did you try that?
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Unread 02-10-2013, 10:44 PM   #11
mustanggarage
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Quote:
Originally Posted by hypernoodle View Post
Dumb question, but did you try turning the knob behind the button counterclockwise after engaging? It pulls the cable more.
beat me to it.
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Unread 02-11-2013, 07:25 AM   #12
alc60560
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There is a plastic bushing thaat the intermediate shaft rides on. If the flange that sticks into the opening there is worn or broken off there is the distance problem. Good luck
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Unread 02-11-2013, 08:32 AM   #13
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Is the shift collar stripped? I'd pull the shafts and the collar for an inspection.
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Unread 02-11-2013, 05:22 PM   #14
JohnOllen
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Thanks for the feedback. Just finished installing the new setup. Letting the liquid gasket set so haven't road tested it yet but it's engaging and disengaging smoothly so far. For sure it was not a matter of the cable not being pulled all the way, I had to do all the tricks just to get the collar to barely engage the intermediate shaft. Even with the fork touching the CAD housing the collar was barely engaging. If the intermediate shaft has moved wouldn't there be more than 3/64 of a gap between the shafts? This is the only jeep I've ever worked on so don't know how the collar/shaft/fork geometry should line up. It just looks like he fork would have to move another 1/2 inch to centre the collar between the two shafts. Hope this works. Like I said, I had the same problem when I had the original vac CAD on it.
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