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post #1 of 11 (permalink) Old 10-05-2019, 06:12 PM Thread Starter
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Long time Commander owner with some problems.

So I've owned my Jeep since 2006 new off the lot and I've never had any issues, and have always done all the regular maintenance. About a week ago I started to hear a whirring noise coming from the rear end starting about 10mph and continues at any speed (regardless of acceleration, braking, turning, etc.). As the week went by it has gotten louder that now I have to talk over it. I changed my rear diff fluid as it was time to do that anyway but it did not get rid of the noise, but it did change the sound from being deeper sounding to a little bit higher pitch. I've checked the rear wheel bearings, and driveshaft for any play, but there isn't any. Anyone have any ideas what it can be?
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post #2 of 11 (permalink) Old 10-05-2019, 07:24 PM
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Originally Posted by IdealAlex View Post
So I've owned my Jeep since 2006 new off the lot and I've never had any issues, and have always done all the regular maintenance. About a week ago I started to hear a whirring noise coming from the rear end starting about 10mph and continues at any speed (regardless of acceleration, braking, turning, etc.). As the week went by it has gotten louder that now I have to talk over it. I changed my rear diff fluid as it was time to do that anyway but it did not get rid of the noise, but it did change the sound from being deeper sounding to a little bit higher pitch. I've checked the rear wheel bearings, and driveshaft for any play, but there isn't any. Anyone have any ideas what it can be?
@IdealAlex;

Just speculating; It could possibly be that your rear axle needs fluid; I'd probably get that checked out. No DTC's showing up in the EVIC?

In any event, welcome to the forum; Post some pics of your Commander when you can; Here are some links if you want to order any parts for repairs or upgrades to your XK;

Chrysler/Jeep Factory Parts: https://www.factorychryslerparts.com/

North American Parts: https://northamericanparts.rpmware.c...unt/login.aspx

JeepinByAl: JBAoffroad.com

JustforJeeps.com - https://www.justforjeeps.com/

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CARiD.com - https://www.carid.com/?gclid=CjwKEAj...NrrxoCEBbw_wcB

Bilstein shocks & struts - Home

WAM Custom Bumpers - https://wambumpers.com/

4WheelParts.com - Truck Parts & Jeep Parts - Lift Kits, Winches, Tonneau Covers, Tires, Wheels, Bumpers, Performance ? 4 Wheel Parts

RockAuto - https://www.rockauto.com/en/catalog/...catalog%2Fjeep

Also, please read the new member required reading below if you haven't done so already; lots of good information in here;

REQUIRED READING!!! New Member Introduction post & other important new member info.

Thanks and again, welcome aboard.


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post #3 of 11 (permalink) Old 10-07-2019, 12:36 PM Thread Starter
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I did try changing the rear ends fluid with the OEM stuff with the friction modifier, and I made sure it was full according to the owners guide. The noise still persisted but it changed in pitch (going from a deeper whine to a higher whine.) I checked the rear wheel bearings again just in case, but that's not it either. Anything else I should look for that could be causing the noise?
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post #4 of 11 (permalink) Old 10-07-2019, 06:58 PM
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Originally Posted by IdealAlex View Post
I did try changing the rear ends fluid with the OEM stuff with the friction modifier, and I made sure it was full according to the owners guide. The noise still persisted but it changed in pitch (going from a deeper whine to a higher whine.) I checked the rear wheel bearings again just in case, but that's not it either. Anything else I should look for that could be causing the noise?
You're talking about the rear differential - which is where you would add the friction modifier if you have QD-II.


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Last edited by Big Blue; 10-07-2019 at 07:43 PM.
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post #5 of 11 (permalink) Old 10-07-2019, 07:28 PM Thread Starter
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Since it's an SRA, isn't the rear differential where you add fluid? Unless I'm missing it, it's the only place on the rear end that has oil in it.
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post #6 of 11 (permalink) Old 10-07-2019, 07:41 PM
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Originally Posted by IdealAlex View Post
Since it's an SRA, isn't the rear differential where you add fluid? Unless I'm missing it, it's the only place on the rear end that has oil in it.
You are correct - what is SRA?

https://www.jeepcommander.com/forums...ns-fluids.html


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Last edited by Big Blue; 10-07-2019 at 07:44 PM.
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post #7 of 11 (permalink) Old 10-07-2019, 07:49 PM Thread Starter
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It's no problem. I'm just lost as to what the noise it or what exactly is causing it. I'm going to try checking the run out and teeth engagement on the gears in the morning and maybe that will point me in the right direction.
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post #8 of 11 (permalink) Old 10-07-2019, 09:21 PM
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Quote:
Originally Posted by IdealAlex View Post
It's no problem. I'm just lost as to what the noise it or what exactly is causing it. I'm going to try checking the run out and teeth engagement on the gears in the morning and maybe that will point me in the right direction.
Very good; Let me know what you find, I'd be interested to know.


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post #9 of 11 (permalink) Old 10-14-2019, 05:14 PM
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It is hard to establish one Whiring noise from another
If it changes from acceleration to deceleration you might also check your u-joint in the rear driveshaft?
As you stated next places would be wheel bearing? But could also be brakes? usually higher pitched.

Good luck with the diagnosis.
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post #10 of 11 (permalink) Old 10-18-2019, 06:47 AM
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I might suggest a rear pinion bearing. My sons truck had a whining sound and it ended up being the rear pinion bearing. Just a thought

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