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Discussion Starter #1
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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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?

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Thanks and again, welcome aboard.
 

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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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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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Discussion Starter #5
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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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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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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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.
Michael
 

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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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check your front driveshaft - it may sound like noise coming from rear due to harmonics but if you have a front ds with 2 rzeppa CVs, thats where I would look...
it may look fine, but ive had bad luck with mine, and when you open up the joints, no grease and lots of play - only found by taking the shaft off.



and second would be the isolator from the front diff cover to frame - if the rubber is shot, and rubbing metal against metal, then you will get driveline noise for sure...
 
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