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Old 02-28-2014, 10:56 AM   #1
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4x4 problems

Trying to find the solution after shifting out of 4x4 my yj pulls to the right like front axle passenger side is still locked in I have to counter steer any suggestions most the time it just stops



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Old 02-28-2014, 11:43 AM   #2
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Sounds like a vacuum problem on the CAD. It takes vacuum to put it into 4wd and vacuum to take it back out again. The CAD diaphragm might be on its way out and needing replaced, or it has a vacuum leak somewhere in the CAD system.

Try stopping completely, and shifting out of 4wd, and then backing up a few feet to relieve the pressure on the axle.

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Old 02-28-2014, 07:55 PM   #3
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ok so I tried backing up that didn't work I checked to see if I was getting vaccum to the actuator on that side and I was could it be the actuator? or are there any other suggestions
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Old 03-01-2014, 08:04 AM   #4
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Ordered a vacuum diaphragm last night from 4wd.com by crown hopefully this fixes the problem
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Old 03-01-2014, 08:55 AM   #5
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Ordered a vacuum diaphragm last night from 4wd.com by crown hopefully this fixes the problem
waste time money...go posi lok
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Old 03-01-2014, 01:39 PM   #6
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Sounds to me like bad bearings or the breaks are hanging up. If it was still engaged it should not pull to one side or the other.
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Old 03-01-2014, 09:12 PM   #7
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waste time money...go posi lok
What he said....

Or just unbolt the center axel disconnect, slide the collar over both shafts, and rotate the whole assembly 180 degrees. It bolts right back in. That's what I did. Never have to second guess 4x4 now. On the down side your front driveshaft will always spin in 2 wheel drive causing some vibes but no big deal. No binding when I turn either. Quickest 10 minutes I ever spent working on my jeep.
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Old 03-01-2014, 09:59 PM   #8
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I replaced the actuator and it's working now other than the passenger side axle seems not to be engaged because it doesn't spin while in snow while the driver side does weird stuff trying to work it all out kinda new with the jeeps tho
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Old 03-02-2014, 07:05 AM   #9
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Hmm. You check the splines and inspect the collar inside the CAD? Something might be causing it to stick. Where at in Indiana are ya. I'm up north about 40 miles from Chicago.
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Old 03-02-2014, 07:10 AM   #10
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I'm in Lafayette the collar is good could it be anything in the diff it self
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Old 03-02-2014, 07:40 AM   #11
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Nice. I'll have to keep you in mind if we make a trip down there.

Not too sure. I don't know how the factory diffs were set up in the front. Still learning my axle knowledge and terminology.

Does is act funny in 2wd? Maybe something up front on that outer end of passenger side shaft
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Old 03-02-2014, 09:02 AM   #12
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Acts fine in 2wd only in 4wd passenger side doesn't pull and drags
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Old 03-04-2014, 07:43 PM   #13
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Still trying to figure this out is there anyone with suggestions
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Old 03-05-2014, 09:59 AM   #14
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Have you tried putting the whole vehicle on jack stands and rotating the front tires by hand while in 4wd?
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Old 03-05-2014, 10:08 AM   #15
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No just was reading about it gonna try it today
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Old 03-05-2014, 07:18 PM   #16
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If I understand this correctly, the passenger tire seems to be moving slower (dragging), and the driver's side is moving faster (pulling), forcing the front end to turn to the right?

It only does this in 4WD when the axles are connected?

Open front differential?
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Old 03-05-2014, 07:30 PM   #17
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On 4x4 hi when I give it gas I have to counter steer then when I go to shift I end up running off the road if I don't watch if I try to climb a mound straight up the driver side only spins
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Old 03-05-2014, 07:32 PM   #18
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When in 4x4 in snow if I down shift and let go of the steering wheel it will spin thus it's dragging only spinning right front axle stock back axle Detroit locker
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Old 03-05-2014, 07:35 PM   #19
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Snowing out today cold as hell didn't get to lift it off the ground and test the dif. Like I was reading about
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Old 03-06-2014, 06:03 PM   #20
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You have a problem with the passenger side wheel hub, could be the bearing is bad or the brakes are dragging. Whatever the case, you have some force causing extra resistance on the passenger side wheel. This is slowing down the wheel, and resulting in the open differential causing the driver's side tire to turn faster, causing the front end to drive to the right.

Here's video to watch:

Watch it and you'll understand how the front end is trying to steer you to the right.
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Old 03-06-2014, 07:11 PM   #21
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It's def not the break since it only does it in 4x4 I jacked it up today put it in 4x4 passenger side didn't turn at all when I spun the driver wheel by hand after looking again I am only getting vacuum on one side of the diaphragm when In 4x4 or 2x4 same side never switches so I have come to believe I have a vacuum leak and thinking of doing the posi lock kit for the front
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Old 03-06-2014, 07:28 PM   #22
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Quote:
Originally Posted by jpthng View Post
What he said....

Or just unbolt the center axel disconnect, slide the collar over both shafts, and rotate the whole assembly 180 degrees. It bolts right back in. That's what I did. Never have to second guess 4x4 now. On the down side your front driveshaft will always spin in 2 wheel drive causing some vibes but no big deal. No binding when I turn either. Quickest 10 minutes I ever spent working on my jeep.
Picture's?
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Old 03-06-2014, 07:41 PM   #23
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Yea the whole vacuum diaphragm or I'm kinda loss with that comment pictures would really be great
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Old 03-07-2014, 01:02 AM   #24
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It's def not the break since it only does it in 4x4 I jacked it up today put it in 4x4 passenger side didn't turn at all when I spun the driver wheel by hand after looking again I am only getting vacuum on one side of the diaphragm when In 4x4 or 2x4 same side never switches so I have come to believe I have a vacuum leak and thinking of doing the posi lock kit for the front
If the source of the problem were due a CAD vacuum issue (failing to slide the collar over and connect the axles together) and you have an open differential, the front driver's side wheel would have no power, no torque. You will not experience torque steer due to a CAD problem - you'll experience a "why the hell don't I have 4WD?" problem when the CAD system goes bad. Trust me, I've had the CAD on my YJ disconnect on me in 4WD (due to manifold vacuum drop). When the CAD disconnects, the open different front axle does not pull at all - you end up with rear wheel drive even though the front drive shaft is turning. This is due to how an open differential works. It needs force feedback from both wheels in order for torque to be generated. When the CAD disconnects, you lose this force feedback. No force feedback, no power.

So, based on the info you've posted here (stock front axle; torque steer in 4WD), the problem is not a CAD vacuum issue. The symptoms point to mechanical drag occurring on the passenger side of the differential. Could be the inner axle assembly/bearing, outer axle assembly/bearing, possibly CAD shift fork causing drag on the shift collar, brakes. The dragging wheel requires the engine to produce more torque to overcome the extra resistance and this torque is equally sent to the other wheel (split 50/50 by the open differential). But the other wheel isn't actually experiencing this extra resistance - the result is excess torque and power. What you end up with is the vehicle turning itself due to uneven distribution of torque caused by mechanical drag on the axle. It isn't due to the CAD failing to connect or disconnect the axle.

If you have a CAD vacuum problem, by all means fix it. But the torque steer isn't due to a vacuum problem in the CAD system.

Edit: The only way the torque steer symptom you've posted could be a CAD issue is if the front differential was locked.

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