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Old 09-13-2016, 07:20 PM
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Whirling noise in rear end of 13 JKU

Ok started hearing this "whirling" noise coming from the rear of my 13 auto JKU four or five months ago, but really did not put much thought into it over the last few months as it has been summer. Since I run my A/C on half to full coupled with the windows being up, tire and wind noise I have not paid much attention to the "whirling" noise, heck most of the time could not even hear it. Today tough it was cool out and I was running with my windows down and the "whirling" noise was very noticeable even my son pointed it out (proving I was not crazy and hearing things). Both of us hearing it was a good opportunity to narrow were it was coming from. Seems to be centered in the rear section of the Jeep leaving me to believe it might be the rear pinion bearing.

Anyone else have or had this "whirling" sound coming from the rear section of their Jeep? If so what was it?

Currently at 55K miles, and yes it is used off road.

Thanks for any input into this noise you might have.

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Old 09-13-2016, 08:48 PM   #2
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Does the tone change or go away when you let off the gas? Best get it checked before there is irreparable damage.

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Old 09-13-2016, 09:06 PM
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Does the tone change or go away when you let off the gas? Best get it checked before there is irreparable damage.
The tone stays the same when I let off the gas more less. It just becomes slower whirling sound. Above 35 it becomes a low pitch whining noise. After that it is drowned out by other noise.

I do not think it will be covered under the power train warrant to many mods around the area the dealer will no doubt point to and blame for any wear issues.

I will be taking it in to my preferred Jeep shop. If I am going to pay I am going to pay folks that don't just see me as a "number" so to speak. At least I know they will fix it right the first time.
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Old 09-13-2016, 09:08 PM   #4
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Wheel bearing. Is it the same going around corners?
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Old 09-13-2016, 10:54 PM
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Wheel bearing. Is it the same going around corners?
No it seems to be in straight line driving only. It has me scratching my head. It is either the pinion bearing or one of the wheel bearings. I am leaning toward it being the pinion bearing. If it is a wheel bearing that would be a cheaper fix. The pinion bearing is going cost a bit.

Just wish I knew for sure it does not seem to be a common problem with JKs.
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Old 09-14-2016, 01:02 AM   #6
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No it seems to be in straight line driving only. It has me scratching my head. It is either the pinion bearing or one of the wheel bearings. I am leaning toward it being the pinion bearing. If it is a wheel bearing that would be a cheaper fix. The pinion bearing is going cost a bit.

Just wish I knew for sure it does not seem to be a common problem with JKs.
Have you checked the dust cover on your rear drive shaft that covers up the pinion seal? If it is crooked it can make contact with the rear differential and make such a noise and it would speed up and slow down with your acceleration.
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Old 09-14-2016, 10:56 AM
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Have you checked the dust cover on your rear drive shaft that covers up the pinion seal? If it is crooked it can make contact with the rear differential and make such a noise and it would speed up and slow down with your acceleration.
I have, it appears to be fine. It is protected by an AEV diff skid plate so nothing looks out of place.
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Old 09-14-2016, 12:12 PM   #8
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I have, it appears to be fine. It is protected by an AEV diff skid plate so nothing looks out of place.
Check it to see of it is loose. This happened to me 2 months ago - it looked fine when parked, but when the driveshaft started spinning it would move on the shaft and start making the noise (usually above 20mph). I run the AEV diff skid BTW and love it - nice choice.
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Old 09-14-2016, 04:52 PM
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Check it to see of it is loose. This happened to me 2 months ago - it looked fine when parked, but when the driveshaft started spinning it would move on the shaft and start making the noise (usually above 20mph). I run the AEV diff skid BTW and love it - nice choice.
I will climb under there and see if it is loose.

Yes the AEV diff skid is a win win mod. It has taken a fair beating over the last three years .
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Old 09-14-2016, 04:59 PM   #10
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Definitely sounds like a bearing, it wouldn't hurt to ask your dealership if they would warranty it before you payed out of pocket. Some dealerships are extremely mod friendly, you could get lucky.

Have you pulled the cover and check inside the diff yet?
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Old 09-14-2016, 08:31 PM
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Definitely sounds like a bearing, it wouldn't hurt to ask your dealership if they would warranty it before you payed out of pocket. Some dealerships are extremely mod friendly, you could get lucky.

Have you pulled the cover and check inside the diff yet?
Have not pulled the cover yet. I am pretty sure the dealer will say no to warranty. I had the factory LSD replaced with another traction aid, run none factory diff covers and once you touch the LSD, gears, locker and such you are pretty SLO out here for anything axle related.

The shop that installed everything is going to "scope" it on Mon because even with me driving we could not duplicate the sound in a way that it could be pin pointed, figures right! Unlike the dealerships around here that would say nothing is wrong, the shop I use believes me and will find what is causing the sound. They are not charging me to find the issue thankfully.
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Old 09-15-2016, 01:01 PM   #12
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Have you carefully inspected the tone rings on each rear axle shaft? There is only a small space between the moving parts and the housing assembly. My buddy just eliminated a noise on her JK by clearing debris from this area. Good Luck.
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Old 09-15-2016, 10:42 PM   #13
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What I like to do for identifying noises like that are to put the rear end up on jack stands (make sure the the rear wheel and tires are off the ground and the front wheels chocked) and have someone else in the vehicle run it in gear/drive.
Use a long flat blade screwdriver or an automotive stethascope and touch the end to diff at the pinion carrier and at the end of the axle tube where the bearings are. The culprit will be the loudest noise. That will narrow down where you need to start looking.
If you can't tell if any of the noises are louder than any other, try listening to the transfer case and then the transmission. Noises like that can sometimes be transmitted through the driveshaft and make it sound like its coming from somewhere else.
You don't have to run it at 100 mph and please be careful of the spinning driveshaft and wheels!.
Good luck and keep us posted.
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Old 09-16-2016, 04:01 PM
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What I like to do for identifying noises like that are to put the rear end up on jack stands (make sure the the rear wheel and tires are off the ground and the front wheels chocked) and have someone else in the vehicle run it in gear/drive.
Use a long flat blade screwdriver or an automotive stethascope and touch the end to diff at the pinion carrier and at the end of the axle tube where the bearings are. The culprit will be the loudest noise. That will narrow down where you need to start looking.
If you can't tell if any of the noises are louder than any other, try listening to the transfer case and then the transmission. Noises like that can sometimes be transmitted through the driveshaft and make it sound like its coming from somewhere else.
You don't have to run it at 100 mph and please be careful of the spinning driveshaft and wheels!.
Good luck and keep us posted.
This is what my shop is going to do on Mon morning.
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Old 09-17-2016, 08:05 PM   #15
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If you just have the rear end off the ground and put it in gear, then be prepared for the check engine light and limp mode. The computer will sense the difference between front wheel and rear wheel speed and throw "implausible" wheel speed codes and limit throttle input.. The good news is they should clear themselves after some normal driving.
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Old 09-20-2016, 06:54 PM
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OK had it checked out and after an hour and two techs and the shop owner listening with scopes the conclusion was there is not any one thing causing the sound but a combination of very minor things at best. Recommendation was to not do anything as it would be chasing our tails opening things up guessing. Labor alone would be stupid expensive and it might not solve the noise. For now it is a "let the sound be" and monitor as nothing is in any immediate danger of failure or damage. If it gets worst and can be pinpointed better then open it up and see.
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Old 09-20-2016, 08:51 PM   #17
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Wow, really? I'm into my diffs 2 or 3 times a year checking things out or working on something . It's a 20 minute job and only cost you new fluid. As a matter of fact when there is any doubt the covers come off.

It's not like you are pulling the tranny apart or anything. Your are not making your mechanics sound very knowledgeable on diffs.
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Old 11-16-2016, 05:03 PM   #18
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I believe this is your culprit, i'm dealing with the same issue myself.
The rear pinion seal guard or dust cover starts to spin and sound like a bearings going bad or a washer spinning on rod.
I found it by jacking up the rear and bringing it up to speed while I crawled underneath it. definitely the source of the noise. I asked a tech about it, and they said it shouldn't move, but after they serviced the seal (which was leaking) the problem is still there and the dust cover is still loose and free to spin.
Here is a photo I jacked from a different thread.

Anyone know how to make it stop? I don't believe in just ignore the noise...
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Old 11-16-2016, 06:52 PM   #19
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Pinion bearing. Same symptoms as the wife's jeep Commander. Had them toss in a trutrac while it was on the rack. Could also be the backlash is off. That's usually requires reshimming but more than likely the pinion bearing.


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Old 11-17-2016, 10:16 AM   #20
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... but after they serviced the seal (which was leaking) the problem is still there and the dust cover is still loose and free to spin.
That sucks - it would have been easy to replace the input flange (which comes with the dust guard already pressed on it) when they had it off to replace the seal. Anyhow, here's what I would do: Clean the mating surfaces of the dust guard & input flange thoroughly using a spray cleaner (I like CRC QD electrical parts cleaner since it is less harsh than brake parts cleaner). Press the dust guard back in place, making sure it runs true. Then use a wicking grade Loctite, or a good quality liquid (not gel) super glue and feed it into the interface between the two parts. I know it sounds kind of hokey gluing it back in place, but there isn't much load on it and the glue has a lot of surface to bond to.
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Old 11-17-2016, 01:24 PM   #21
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https://youtu.be/RgtGMrVZmgw

Does it sound like this? This is mine, rear jacked up & bad pinion bearings.
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Old 11-20-2016, 08:41 AM   #22
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That sucks - it would have been easy to replace the input flange (which comes with the dust guard already pressed on it) when they had it off to replace the seal. Anyhow, here's what I would do: Clean the mating surfaces of the dust guard & input flange thoroughly using a spray cleaner (I like CRC QD electrical parts cleaner since it is less harsh than brake parts cleaner). Press the dust guard back in place, making sure it runs true. Then use a wicking grade Loctite, or a good quality liquid (not gel) super glue and feed it into the interface between the two parts. I know it sounds kind of hokey gluing it back in place, but there isn't much load on it and the glue has a lot of surface to bond to.

I was thinking the same thing, but silicon.
But I did just as you said and boom- the noise is gone.

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