How can you say they all whine? How many have you driven? I’m sure some do.... but “all”?

 

Well, that's a fair question, but at the same time I have yet to read a post where someone has one that doesn't. Mine is fairly subtle, until I focused on it, I hadn't really noticed it. If I had to venture a guess, and that's all it is, it may be from the aggressive gearing. I know in a typical rear end a LOT of people complain about a whine in the differential at a 4.10 gear or higher, irrespective of shimming.

 

Fair enough. I suppose owners that have no issue are not on here looking for info on gear whine. I’d love to have the chance to drive several cars, but that not possible in my local. I’ll ‘play’ with some soundproofing and see if I can lower the hummmm just a little more.

 

Not everyone has a sharp mechanical ear to hear it I am thinking. Also unless the windows are up, top on, no radio, no high fan blower noise and not particularly paying attention to any type of drivetrain or engine noise it may not be audible to many folks, let alone knowing what a ring and pinion whine sounds like.

 

My 2020 had it, albeit very faint.

It might get better when DCT production switches from Tremec to GM/St. Cats. As I understand it, GM is adding an extra assembly step regarding the backlash “sweet spot” and the ability to add shims more precisely.

 

Interesting. Just curious .... where did you get your info?

 

The old cliche’ that “I’m not at liberty to disclose my source” comes to mind. But if I had a DCT that was making a bunch of racket, I’d hold off on pushing for a fix until assembly moved. There’s nothing mechanically wrong with the current assembly method, but the “new and improved” method is supposed to be just that. A ton of time and resources were put into the forthcoming move to St. Catharines, no doubt.

 

Thx. Any idea when ‘the move’ will take place? Mine doesn’t ‘make a bunch of racket’ but there is a noticeable ‘whine’ in the 65-70 mph range. It’s annoying and I can’t un-hear it. I take it back to the dealer next week to measure the frequency and amplitude. The we'll see what GM says.

As a side note, I was playing around today insulating the engine side of the removeable panel in the rear trunk. Looking down at the tranny, I noticed there are cone-shaped aluminum shields, bolted to the tranny, that shield the CV joints. When I tweak them with my finger, they ring like a bell. I can’t help but wonder if they amplify diff vibration when it hits a resonance frequency. I’ll probably ‘deaden’ them but not until after my dealer appmt

 

GM anticipates taking DCT product in-house sometime during the second quarter of 2022.

 

Good to know. Thank you.

 

Took delivery on my new 2022 with 6 miles on it, Did a Rt66 cruise with some buddies and I was impressed, with no obvious weaknesses and as far as noise compared to other vehicles it is normal to quiet. Buffering and insulation plus harmonic stereo systems have all but eliminated the loud whining you would hear on older model supercars. Having said that and being new here, but certainly not new to corvettes I will answer it as simply as I can. I traded my 200K+ Audi for a C8 for economic reasons. There is a reason you can buy 2 C8's for the price of 1 R8. Component engineering and design plus quality. The first time I took out my V10+ I called everything before it obsolete. This is number 6 for corvettes over the years. I have also had 3 Audi R8's over the last 6 years and there just can not be a fair comparison. Having said that the C8 is very well done for the price. And I will have the Z07 one day as well....probably never to luxuriate in an R8 again for the rest of my life. The moral of the story is you will never catch me above 175 in a C8. But in the R8 175 feels like 90 just saying. And there is not a sound not even a peep of a whine, it is sublime. I am lacking power at the moment but that fix is coming when the Z07 arrives in or about 2024.

 

Thank for responding. It’s helpful to know they DO NOT all do it!

 

Update: I took the car in to the dealer last Thursday. They instrumented the transmission and took noise/sound recordings of my ‘whine’. The service Mgr left me a message yesterday saying GM advised them to replace the transmission. UGH! So.... I’m wondering if this will result in diminished value if/ when I sell the car?

Also, since I’m in Iowa and don’t need the car for a few months, I’d kinda like to wait until tranny assembly is brought ‘in house’. I’m hearing 2nd quarter of ‘22 (thx ZeroDark30!) but more specific info would be appreciated. Thx.

 

The diff ring and pinion whine would have to be on the bad side for me to want the complete transaxle replaced. Considering what I hear on my car right now, that will not happen. Your service records will show the transaxle assembly was replaced and why, that shouldnt ever hurt the trade in or the resale imo.

 

Thx. I’m certainly not trilled about having it done, but it must be bad enough for GM to agree to a swap. And I don’t want to live with it the way it is. So I’ll proceed with an expectation that it will be done right.

 

Nope. It's routine for most new vehicles to have warranty work and/or warranty replacements. A buyer isn't going to be upset over new/better/improved parts, especially when dealer-installed and covered under warranty.

 

Update: The dealer replaced the transaxle a few weeks ago but the whine is still there. According to their sophisticated sound measurements, the whine is reduced, but my ear says otherwise. I had planned to do some sound proofing ... but held off in the hope that tranny swap would solve everything. I’ll now move forward & try some vibration dampening and noise reduction tricks and see what happens.

If anyone else is dealing with this issue, please chime in. Would like to hear of your experience.

 

Mine has gear noise. Don’t care much. Headers and high flow cats fixed it.

 

Ha! Good one. I wish it didn’t bother me, but it does. Too much OCD going on. My wife says I’m ‘neuro divergent’ .... whatever that is.

 

I’m like that with rattles. Much easier to fix! It’s gear whine, not much to eat done with that.