Plenty of 392s have this issue too, people get their rear ends replaced under warranty but the issue seems to persist. Mine does it but I don't worry too much about it. Unless I'm finding metal shavings in the fluid, I'm not going to worry about it.

 

How often do you replace the fluid? Thanks for the feedback

 

Mine has always started to whine right at 80. Nice audible speedo . Recently had the diff. fluid changed at 26K miles and seems to be a bit quieter now.

 

Thanks im def going to try new fluid!

 

Have the driveshaft inspected, specifically the carrier bearing.

If the carrier bearing is good, then have a service manager conduct a ride-along to hear the sound you are experiencing between 45-60mph. They can then look into replacing the rear differential and fluid under warranty.

 

Couldn't help but notice you seem to have an alleged solution to 99.9% of all tech issues posted on this Forum.
Which leads me to my question...what exactly are your credentials? Are you an automotive, design, or mechanical engineer? Auto technician? All of the above? Or just a self proclaimed expert on everything?

 

I have the same issue replaced both the fluid and differential but the whine is still there...I just learned not to go 45 anymore.

 

Same for me on my 2016 Hellcat Challenger. The whine went away for just a bit after the work was done, but came back pretty quickly. I was pretty good about following the original break-in process also. It's not bad though, any non-car person passengers would probably never notice.

 

As the miles increased on my 2018 Hellcat the "diff" noise got pretty loud. I spoke to a SA about this and he said I could bring the car in with some complaint about the noise and he could then have a tech add some fluid (friction modifier?) to the diff to see if this helped. If it did fine. If not this step was out of the way and I guess the diff could be replaced if the noise was bad enough to warrant it.

But I never did this. I decided to just drive the car and if the diff failed to get it fixed under warranty. But my plan was and still is to have the diff fluid changed out/replaced with fresh factory fluid at 20K miles. (The car currently has around 17600 miles on it.)

Then at around 13K miles I got a puncture in the driver side rear tire. I replaced both rear tires with the same tires as were on the car. The tires were not worn that much maybe not quite half worn (and the front and rear tire wear was even believe it or not) but with 707hp on tap I don't want a new tire on one side of the rear axle and a nearly half worn out tire on the side of the rear axle so I replaced both tires.

After having new tires installed the "diff" noise was gone. Seems the bulk of the "diff" noise was tire noise. What noise I hear now if it even comes from the diff it is not any cause for concern.

 

Thats really interesting I never thought about that, maybe the tire noise is what Im hearing. Thanks for the feedback, but I only hear the whine around 45 and 65 is that the same with you?

 

I had not had the rear end whine but I can tell you one sure way to get rid of it.

Don't use a @Per4Mance Development Diff brace launch really hard and break the Pumpkin!

There are lots of thread about this and I won't say it's a common problem but there is a good percentage of those that had the problem.

I hope you get it fixed!

Linda

 

Haha thanks im thinking about it! but a lot of people are saying even with the new rear end it still made the noise!

 

My 392 from new had a pretty noticeable whine at 58-60 mph. Changed the fluid to the Viper Spec 75w140 fluid and has made it much quieter. Rear whine will change with the throttle on and off the gas.

 

The 45-65 whine is a very common complaint with ZF 230mm LSD. my 16 Scat whined with 3 miles on it . changing to 75W140 plus Mopar additive quieted it some. 6.000 miles later and many 1.50 60's and it has not changed.... nature of the beast..

 

Plenty of 392s have this issue too, people get their rear ends replaced under warranty but the issue seems to persist. Mine does it but I don't worry too much about it. Unless I'm finding metal shavings in the fluid, I'm not going to worry about it.

I have the same issue replaced both the fluid and differential but the whine is still there...I just learned not to go 45 anymore.

Hi onewidecat1, Dextar, and Red_SRTHellcat
We certainly understand why this may be concerning. We kindly recommend having your dealer inspect this concern for you as they are in the best position to assist. If you do work with your dealer, we would be more than happy to provide you with additional support. If you have already visited the dealer and your still hearing this sound feel free to send us a PM so we can assist your dealer in finding a solution.
Rob
DodgeCares

 

Hi onewidecat1, Dextar, and Red_SRTHellcat
We certainly understand why this may be concerning. We kindly recommend having your dealer inspect this concern for you as they are in the best position to assist. If you do work with your dealer, we would be more than happy to provide you with additional support. If you have already visited the dealer and your still hearing this sound feel free to send us a PM so we can assist your dealer in finding a solution.
Rob
DodgeCares

I have 530ish miles on 20 Redeye mine has whined at 45mph since mile 15 when I took possession.
Thanks for monitoring our problems and or concerns.

 

Change the rear end oil..
My Demon was 5oz low when I changed mine at 700 miles.
I used Amzoil Severe Gear with Slip Lock. I just seen last week a 2018 Hellcat that was also low 4oz upon inspection and fluid change.

 

Put the Viper diff fluid in, It fixed mine. I believe it is like straight 80 or 90 weight and it hushes it down real quick

 

This has been a common problem with many hellcats and I wanted to know if anyone has a solid solution. When the car is at 45 mph or 65 it sounds like a minor whine coming from the rear end. I give the car very little throttle and it will start to make the noise. The car has made the noise since new and I now have 6400 miles on it. I've ignored it but It is now a little worrying to me. And yes, I did break the car in correctly according to the service manual. Anyone have confirm fixes that I should try? I've heard people doing a fluid change with a friction modifier, and people going under warranty to get a new pumpkin. Thanks

This has been a common problem with many hellcats and I wanted to know if anyone has a solid solution. When the car is at 45 mph or 65 it sounds like a minor whine coming from the rear end. I give the car very little throttle and it will start to make the noise. The car has made the noise since new and I now have 6400 miles on it. I've ignored it but It is now a little worrying to me. And yes, I did break the car in correctly according to the service manual. Anyone have confirm fixes that I should try? I've heard people doing a fluid change with a friction modifier, and people going under warranty to get a new pumpkin. Thanks!

Mine has done that from day I picked it up. I have a 2015 now has 24,000 and has a tune still makes the same sound and never had an issue. Changed the rear end fluid every 7000 miles did not make any difference kind of sounds like the 1970 440 Six Pack I used to have.

 

I gotta ask how you all think you hear a whine in the rear at any speed over 40, the SC whines, the car itself growls, and the tires are always squealing. Mash the peddle harder and you will only hear the sounds of fury! Makes me smile just writing it! Good luck.


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Sometimes when reading these thread on rear end whines I wonder about them and think why I don't hear anything I would complain about.
The Hellcats came off the line more of a race car.Race cars make noise. ?
Maybe I just don't have the problem with my Hellcat or maybe it's because I also drive a 3500 Ram Diesel Dually and anything is more quiet than that.

Linda

 

Well aware the Hellcat while probably not as close to a race as you portray it is a high performance car to be sure and will not be Lexus quiet.

Didn't expect it to be.

With a new car and becoming familiar with Hellcat while I didn't expect quiet what I did hear in some ways was more than I expected to hear.

But over time I've become more familiar with the car and the noise it makes and really while I hear the supercharger at lower speeds, and some diff whine at intermediate speeds, and will probably once again as the "new" tires wear hear tire noise at higher speeds I will know the source of the noise and not really give it much thought.

It doesn't help in my case that I do not drive the car every day and my two cars are quite different so when I return to my Hellcat it is in some ways unfamiliar to me.

 

@Rockster I understand your thoughts. This is especially true.

"over time I've become more familiar with the car and the noise it makes and really while I hear the supercharger at lower speeds, and some diff whine at intermediate speeds, and will probably once again as the "new" tires wear hear tire noise at higher speeds I will know the source of the noise and not really give it much thought."


Linda

 

So here's an update with my current situation, I changed out my rear end fluid and like someone on this thread has said before on their demon it was in fact 5 oz low on fluid.... I replaced it with the mopar 75-140 viper fluid and mopar friction modifier. It has been 2 days and the whine is still present, and did not get quieter and now I can notice it at higher speeds. I'm going to give it a couple more days then try the amsoil gear oil. Has anyone have any input? and yes, you guys are right this noise is completely normal and you can expect this out of a 717 horse power car but I have buddies that don't have any noise at all and I guess you can say I'm a perfectionist.

 

Changing gear oil seldom has any effect on the whine, if you have groan or chatter around turns then the oil and additive will cure that, but whine usually more about gear lash and setup and different oil can't do anything about that.


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Switch to Amzoil with Slip Lock

 

Im going to do it for sure, do you think it will fix my problem?

 

Any update on this? I'm looking for a fix as well. My 2018 is whining on and off the gas pedal.

 

Two options are to have the differential inspected for warranty. They see if it needs to be replaced or changed with new lube and friction modifier.

 

Amzoil with Slip Lock solves the Whine

 

sadly I have contacted ZF with no response, so it’s either really really normal or really really???

 

One of my good friends is a service adviser at a local dodge dealer and they say the 392's challengers jeeps and chargers and hellcats can whine. He said its like a lottery if you get a whiny one or not. He said its normal and will do no harm. Then again he said if you do go through warranty, theres a chance you can still have a whine! So he tells me if its not to bad to deal with it.

 

My take is if the whine was normal then all cars would have the whine but they don't so it can't be normal.

For any dealer saying it's normal, have him pull a car off the lot and take you for a ride and if it's quiet then he owes you a new rear end.


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Best way to fix it is put a Ford 9” in it, other than that ZF has a lotta splain’in to do Lucy

 

Due to all the whining mechanically and humanly, dodge needs to lose the ZF diff in the near future with ZF turning a blind ear to the issue