Diff Whine ... Common?
Race Director
Joined: Jun 2001
Posts: 10,084
Likes: 3,055
From: CA
My 2020 had gear whine, and my 2021 also has gear whine. I'm not crazy about it, but I know I'll have to live with it. Hopefully, they will improve it in a few years when I get a Z06 (or maybe I won't be able to hear it over the engine noise 
). By the way, putting the exhaust in Track Mode helps the gear whine. 
). By the way, putting the exhaust in Track Mode helps the gear whine.
Burning Brakes
Joined: Sep 2019
Posts: 1,089
Likes: 668
From: Orange County, CA
Mine had a whine for the first maybe 6000 miles. It went away.
I wouldnt have replaced the transmission unless it got significantly worse. It was mild.
Having a trans repalced is a negative mark on the cars history. That event implies there was something seriously wrong with it.
I wouldnt have replaced the transmission unless it got significantly worse. It was mild.
Having a trans repalced is a negative mark on the cars history. That event implies there was something seriously wrong with it.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
Mine had a whine for the first maybe 6000 miles. It went away.
I wouldnt have replaced the transmission unless it got significantly worse. It was mild.
Having a trans repalced is a negative mark on the cars history. That event implies there was something seriously wrong with it.
I wouldnt have replaced the transmission unless it got significantly worse. It was mild.
Having a trans repalced is a negative mark on the cars history. That event implies there was something seriously wrong with it.
Burning Brakes
Joined: Sep 2019
Posts: 1,089
Likes: 668
From: Orange County, CA
This is a cool video on gear setup if you want to nerd out like me.
Last edited by GTUnit; Mar 8, 2022 at 01:22 PM.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
Keep in mind that with the C8, in the era of heavy social media exposure, GM may be more inclined to do whatever it takes to keep the customer happy (quiet) rather then what is most prudent by mechanical standards. If it annoys someone enough to where there is a risk of them making a stink about, and damaging halo model perception, it they may fix it whereas some years ago they may have advised against it.
This is a cool video on gear setup if you want to nerd out like me.
Ring & Pinion Patterns explained, back lash vs pinion depth - YouTube
This is a cool video on gear setup if you want to nerd out like me.
Ring & Pinion Patterns explained, back lash vs pinion depth - YouTube
I agree that GM might have been trying to ‘get me happy’. But if the OE tranny wasn’t defective, replacing it with another that is equally noisy is counterproductive. It just pisses me off more for going through a lot of anguish for no improvement. I’m still waiting to hear what they say about the 2nd trany
Many thanks for the video. Tech is me. I’m an ME by trade ... with OCD ... so it’s right up my alley. Ha! I wish the narrator would have explained the effect of having the pattern ‘off’.
Last edited by Thera p; Mar 8, 2022 at 06:56 PM.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
I agree that GM might have been trying to ‘get me happy’. But if the OE tranny wasn’t defective, replacing it with another that is equally noisy is counterproductive. It just pisses me off more for going through a lot of anguish for no improvement. I’m still waiting to hear what they say about the 2nd trany
Many thanks for the video. Tech is me. I’m an ME by trade ... with OCD ... so it’s right up my alley. Ha! I wish the narrator would have explained the effect of having the pattern ‘off’.
Many thanks for the video. Tech is me. I’m an ME by trade ... with OCD ... so it’s right up my alley. Ha! I wish the narrator would have explained the effect of having the pattern ‘off’.
Last edited by Thera p; Mar 12, 2022 at 03:10 PM.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
Pro
Joined: Feb 2001
Posts: 651
Likes: 42
From: Zimmerman MN
I have been an auto tech for 35 years & owned a Corvette shop for 20 years. I bought a 22 3/26/22 that has only made the trip home. Has 30 miles on it now. Heard the diff whine on the way home & was concerned. In any of the previous generations what I heard would indicate a problem. After reading this & looking at the design I will attempt to turn off my mechanic ear.
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Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
I have been an auto tech for 35 years & owned a Corvette shop for 20 years. I bought a 22 3/26/22 that has only made the trip home. Has 30 miles on it now. Heard the diff whine on the way home & was concerned. In any of the previous generations what I heard would indicate a problem. After reading this & looking at the design I will attempt to turn off my mechanic ear.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
Per fellow member ZeroDark30 ( thank-you sir!) has indicated that the transaxle assembly is being moved to a Canadian GM facility (from a Tremec plant). It’s unclear what .... or if any.... improvements will result from the change. Apparently the move is underway but a completion date is unclear. If anyone has additional info regarding the move, I’d very much like to hear from you. My dealer has offered to order me a ‘23 in the hope of getting me happy, but I don’t want to order too soon if an improvement is near. Thx all for your feedback.
Last edited by Thera p; Mar 31, 2022 at 09:43 AM.
Pro
Joined: Nov 2017
Posts: 713
Likes: 506
The HD pickup trucks are known to produce gear whine at certain speeds. Totally normal per the way the ring and pinion are set up for the heavy duty use the truck will likely see.
Perhaps this is a similar situation? That the ring and pinion are set "aggressively" because of the hard launches capable with launch control? I've driven a few C7s before and almost all of those had some sort of gear whine. I drove a brand new Hyundai Kona N and it had some gear whine as well.
Perhaps this is a similar situation? That the ring and pinion are set "aggressively" because of the hard launches capable with launch control? I've driven a few C7s before and almost all of those had some sort of gear whine. I drove a brand new Hyundai Kona N and it had some gear whine as well.
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
The HD pickup trucks are known to produce gear whine at certain speeds. Totally normal per the way the ring and pinion are set up for the heavy duty use the truck will likely see.
Perhaps this is a similar situation? That the ring and pinion are set "aggressively" because of the hard launches capable with launch control? I've driven a few C7s before and almost all of those had some sort of gear whine. I drove a brand new Hyundai Kona N and it had some gear whine as well.
Perhaps this is a similar situation? That the ring and pinion are set "aggressively" because of the hard launches capable with launch control? I've driven a few C7s before and almost all of those had some sort of gear whine. I drove a brand new Hyundai Kona N and it had some gear whine as well.
Perhaps you are right.... but I’m disappointed. I’ve never had a new vehicle with a ‘whiny’ differential. Older vehicles, - yes. I also have a C5 and C6 GS. Both are quiet.
Instructor
Joined: May 2021
Posts: 122
Likes: 64
From: W. PALM BEACH FL
6th Gear
Joined: Mar 2022
Posts: 6
Likes: 3
gear whine
I’ve started to notice some diff gear whine in my ‘22 HTC. 700 miles. There’s a noticeable whine in the 65-70 mph range, regardless of gear. So I’m wondering if others have noticed it and if you’ve addressed it with GM? I’m probably more interested in hearing from those that don’t have an issue since I’m anticipating the “they all do that “ response. The local service Mgr has driven mine and stated ‘he wouldn’t be happy if it was his car’ ... so I hope he will go to bat for me. I made a similar post on the ‘general’ forum but didn’t get much useful info. I hope this group is more helpful.
Racer
Joined: Sep 2004
Posts: 416
Likes: 29
From: Whiteville NC
Whine
I picked up my 22 coupe 2lt Oct 1 and it has whined since that day. Dealer is looking into it but no info. I found your post today! Looks like it may be inherent for the C8 but I don't like it!!!
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
My dealer has offered to order me a ‘23, but there is no way to guarantee it will be better. I’m going to go for it & hope for the best.
What does ‘looking into it’ entail? Keep us posted on your progress.