Diff Whine ... Common?
Thread Starter
Racer
Joined: Mar 2019
Posts: 355
Likes: 169
Mine whines at steady state in the 65-70 mph range .... so almost all the time on roads in my area. If it only did it during de-cel in the 50-60 range, I could live with that. Paid big $ for it & expected better.
Racer
Joined: Nov 2021
Posts: 482
Likes: 231
From: Costa Mesa, CA
The ring gear and pinion gear must mesh perfectly. If not, either the gear toe or heel makes contact alone, causing the whine. The way to check alignment is to smear heavy grease on the two gears and slowly rotate them. You are looking for a pattern where the grease is compressed only in the middle of the gear faces. It's easy to see if there is more toe or heel contact. It is adjusted by inserting/removing shims. Continued operation with a misaligned ring and pinion will cause failure of one or both. Once properly shimmed the whine will disappear.
In the old days you could do this yourself with Chevy 'pumpkin' rear ends. That's not true today. This is a job for the dealer and the sooner you get it repaired the better. Do not continue to operate the vehicle.
Ray
In the old days you could do this yourself with Chevy 'pumpkin' rear ends. That's not true today. This is a job for the dealer and the sooner you get it repaired the better. Do not continue to operate the vehicle.
Ray
Racer
Joined: Nov 2021
Posts: 482
Likes: 231
From: Costa Mesa, CA
Ray
Racer
Joined: Nov 2021
Posts: 482
Likes: 231
From: Costa Mesa, CA
In the Army I was a tanker. We did all the work ourselves. In the rain, in the snow, in the mud. But my experience as a kid paid off.
Ray
6th Gear
Joined: Mar 2022
Posts: 6
Likes: 3
hi -I was at a corvette meet yesterday and asked C8 owners whether they heard a whine - two said no and two said yes but it was faint. I'm taking it in to the dealer and will ask him about it - looking at all the threads I'd draw this conclusion:
1. given that this forum has thousands of viewers and only those with a noise problem respond - I'd guess the majority have quiet rear ends.
2. given that some are quick to live with it and some aren't (I don't want to live with it and don't see why I should), it suggests that there is a continuum of gear noise from loud to barely noticeable - so it isn't a yes/no question, it is a "how much" question
I'll let you know what the dealer says.
1. given that this forum has thousands of viewers and only those with a noise problem respond - I'd guess the majority have quiet rear ends.
2. given that some are quick to live with it and some aren't (I don't want to live with it and don't see why I should), it suggests that there is a continuum of gear noise from loud to barely noticeable - so it isn't a yes/no question, it is a "how much" question
I'll let you know what the dealer says.
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Racer
Joined: Nov 2021
Posts: 482
Likes: 231
From: Costa Mesa, CA
hi -I was at a corvette meet yesterday and asked C8 owners whether they heard a whine - two said no and two said yes but it was faint. I'm taking it in to the dealer and will ask him about it - looking at all the threads I'd draw this conclusion:
1. given that this forum has thousands of viewers and only those with a noise problem respond - I'd guess the majority have quiet rear ends.
2. given that some are quick to live with it and some aren't (I don't want to live with it and don't see why I should), it suggests that there is a continuum of gear noise from loud to barely noticeable - so it isn't a yes/no question, it is a "how much" question
I'll let you know what the dealer says.
1. given that this forum has thousands of viewers and only those with a noise problem respond - I'd guess the majority have quiet rear ends.
2. given that some are quick to live with it and some aren't (I don't want to live with it and don't see why I should), it suggests that there is a continuum of gear noise from loud to barely noticeable - so it isn't a yes/no question, it is a "how much" question
I'll let you know what the dealer says.
He said Chevy does not want the dealers working on them because none of the techs have been trained on the transmission.
Were they allowed to open them up, adjusting lash is rather straight forward.
Ray
Burning Brakes
Joined: Oct 2001
Posts: 860
Likes: 40
From: Woodforest
I have a 2022 HCT with 7500 K on it now and my differential whines at most speeds including the common 45 mph zones I run through. It does it at highway speeds as well. I never had this issue with my C3 - C7 series of vettes so this is a bit irritating.
I mentioned it when I brought it in for the oil and filter changes and they added 1 qt to the transmission. It didn't quiet it down. They wouldn't look into it however as it was the Express Service section.
I mentioned it when I brought it in for the oil and filter changes and they added 1 qt to the transmission. It didn't quiet it down. They wouldn't look into it however as it was the Express Service section.
2nd Gear
Joined: Mar 2024
Posts: 2
Likes: 0
From: so/cal
My 2024 non-Z51 (coupe) has it, too …
My whine is fairly noticeable unless the windows are down. Also mine is in a tight range; 74-76. It’s on float or barely foot on gas. It’s a bit annoying but for SURE not worth replacing the tranny, esp since it may exhibit the same. Since day 1, it has 2200 miles on it now.
Burning Brakes
Joined: Oct 2001
Posts: 860
Likes: 40
From: Woodforest
22 HTC Diff whine as well
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.
Stick with it. They will do everything they can to convince you it is normal and its not. Back in the day we would be shimming the diff to fix this but somehow this is way more complicated now.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,613
From: Southwest Florida
The ring gear and pinion gear must mesh perfectly. If not, either the gear toe or heel makes contact alone, causing the whine. The way to check alignment is to smear heavy grease on the two gears and slowly rotate them. You are looking for a pattern where the grease is compressed only in the middle of the gear faces. It's easy to see if there is more toe or heel contact. It is adjusted by inserting/removing shims. Continued operation with a misaligned ring and pinion will cause failure of one or both. Once properly shimmed the whine will disappear.
In the old days you could do this yourself with Chevy 'pumpkin' rear ends. That's not true today. This is a job for the dealer and the sooner you get it repaired the better. Do not continue to operate the vehicle.
Ray
In the old days you could do this yourself with Chevy 'pumpkin' rear ends. That's not true today. This is a job for the dealer and the sooner you get it repaired the better. Do not continue to operate the vehicle.
Ray
Your post was a good read and info on why some of our cars (like mine) whine but from a practical standpoint no owner will ever get that procedure done because dealers continue to say it’s normal.
Again, informative post.
Drifting
Joined: Aug 2022
Posts: 1,876
Likes: 782
From: Stamford, CT
Advanced
Joined: Jun 2024
Posts: 54
Likes: 12
From: Kentucky
My new 2024 Z51 has noticeable gear whine. I had a ~400 mile drive home from the dealer and I started really noticing it toward the end of the trip, which was all back roads with varying speed and zero cruise control. My race mechanic friend who owns a 2023 and has worked on and tracked multiple C8s just rode in mine today and said it's not normal and this is the first C8 he's seen with this noise. He said it's loud enough for him to consider unacceptable in a new $80k car.
I'm going to just deal with it until the car hits 1500 miles. I assume if I took it in right now they'd just tell me it's normal to have noises during break in, which might end up being true.
I'm going to just deal with it until the car hits 1500 miles. I assume if I took it in right now they'd just tell me it's normal to have noises during break in, which might end up being true.