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Discussion Starter · #1 ·
Just curious if anyone has experienced this or know what it may be. I bought my 2014 in May of 2016 and only recently I have noticed a whining from the rear end. It's not the tires or brakes, sounds like gears and most prevalent under 35 mph while I am braking. Sounds independent from the transmission. I'd like to think it is all in my head but now because it is there, I hear it all the time as well as my passengers. Just looking for any direction. Appreciate any input.

Tom
 

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check your rear differential fill plug, the plug will be about even with the axle tubes
you should be able to put your index finger in the hole to the first knuckle & bend your finger tip downwards. There should be oil on your finger tip.
Some people like to have it all the way to the lip of the hole & that is OK too
 

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Discussion Starter · #3 ·
Thank you. I have the lifetime warranty on the truck so I can bring it back to the dealer to check. I was looking to make sure I wasn't off-base before heading to the dealer.
 

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I have a 2011 Challenger and was experiencing the whine at about 1800 RPMs. It was so annoying, just the right frequency to mess with my hearing. Took it to dealer and drove tech about 1/4 mile and he said you need another differential.

He told me he suspected there was a small batch of defective diffs that went into the Challenger, he suspected the back cut of the gears during manufacturing was out of spec.

Anyway they drop a new diff in and it's been perfect since. If they hear the whine I would not except anything less than a new differential.
 

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I have a 2011 Challenger and was experiencing the whine at about 1800 RPMs. It was so annoying, just the right frequency to mess with my hearing. Took it to dealer and drove tech about 1/4 mile and he said you need another differential.

He told me he suspected there was a small batch of defective diffs that went into the Challenger, he suspected the back cut of the gears during manufacturing was out of spec.

Anyway they drop a new diff in and it's been perfect since. If they hear the whine I would not except anything less than a new differential.
 

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Truck going to dealer next. I will update this thread with what is found... Thanks,
Hi ponderosaqtr,

Please don't hesitate to send us a PM with any questions or concerns that may arise during your appointment. We're happy to assist if needed!

Andrea
Ram Social Care Specialist
 

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Discussion Starter · #8 ·
Update.

I spoke with the mechanic today at the dealer and he suggested that it may be pinion bearings. I have to drop the truck off for 2-days next week for them to take apart and assess what needs replacing. I believe he is on to something as I found this on the Internet which pretty much sums up what I hear.

“Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears.”

It came from this site,
http://www.differentials.com/diagnosing-differential-problems/

I will update once the work has been completed.
 

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2014 345ci 8hp70 44-44 3.92 Truetrac NX Express Comp Greene Racing
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Is it the same type of sound as the gear teeth whine when traveling in reverse?
 

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Discussion Starter · #10 ·
Similar but more variable in tone and as it decelerates it goes from a higher pitch whirl to a more distinctive bumpy whirl, akin to a baseball card in spokes.
 

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Discussion Starter · #11 ·
Got all the way to the dealer to have them inform me that their lift was broken. Have to reschedule. Was a nice 60-mile drive to work after that...I will update when I have more.
 

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Is it the same type of sound as the gear teeth whine when traveling in reverse?
About that... Is the whine in reverse (4x4, 8 speed) considered "normal"?

-K
 

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Discussion Starter · #13 ·
I couldn't answer that myself but I hear that in other vehicles I own. I would imagine it may be as the gearing is not meant to go over a certain speed and if you back quickly, you will hear that whine...
 

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i had that same whine in my past ram, it was a 2009 ram sport,..

they rear end had to be rebuilt, but I was lucky it was made under warranty, plus their was a recall on that

after the rebuilt, the whining noise was gone.

if I remember, the pinion bolt was loose or something like that,.

.they had to change the pinion and gear, and for some reason my clutch were bad as well./// I did post about it back then so you could try to find it, its on this forumz.
 

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Discussion Starter · #15 ·
Update and Resolution. Truck went in for two days and all of the rear-end bearings were replaced. Whining has stopped. Didn't need MaxCare as this was a drivetrain warranty item. Hope this is it for a while.
 

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The gear teeth are designed for forward motion, when reversed at ample speed you get a straight cut effect if you've ever driven a dog-box gear set.
 
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