2014 silverado whirl noise when accelerating at 35 mph

[Nnecaise16]

I recently purchased a 2014 silverado 5.3 z71 4x4. I’ve noticed when accelerating hard I hear a whirl noise. It is most comming when accelerating hard around 35 mph. I am attaching a video of this noise.

DA398929-2ADD-4097-BC4E-233E2104CC47.mov

[Cupton]

Are you in Auto 4WD? I’ve noticed a different sound between 2WD and Auto when accelerating. Happened in my ‘15 and now in my ‘18 Sierra. Not sure if this is the sound you are hearing? But if it is then it’s normal. The link you posted won’t open for me.

[dmorrisL86]

Maybe there’s a supercharger lurking under the hood...how hard is said acceleration? Haha

[Nnecaise16]

No it is in 2wd. And usually around 2500 rpms. It will do it at different speeds also. I brought it to the dealership and they are thinking it may be the serpintine belt slipping but it almost sounds like it is comming from underneath the truck. I’m hoping that it is as simple as a slipping belt!

[thefishhawk]

Probably that flapper valve in the exhaust.   You'll find some threads on a search.   You can take a small c-clamp and clamp it open and then see if it keeps doing it so you'll know if it's something else.     It's normal but if it bothers you you can leave it clamped that's what I did.  

[vinnymarley]

My truck is doing the same thing did you find out what was causing the issue? 

[Weslley Vilela]

Hello ! Im having the same issue! Any idea of what could be? Thank you

[AA24]

I recently noticed the same thing on my 2014 Silverado around 95,000 mi. Following and hoping someone has a solution. 

[GMCustomerService]

On 5/24/2024 at 9:02 AM, AA24 said:

I recently noticed the same thing on my 2014 Silverado around 95,000 mi. Following and hoping someone has a solution. 

We are sorry to hear about this concern with your Silverado and would like to take the time to learn more. Please send us an email to [email protected]. Make sure to include your Username and Forum name in the subject line with additional details. We look forward to your email. 

[mikeyk101]

2 hours ago, GMCustomerService said:

We are sorry to hear about this concern with your Silverado and would like to take the time to learn more. Please send us an email to [email protected]. Make sure to include your Username and Forum name in the subject line with additional details. We look forward to your email. 

And you can do this on a truck with expired warranty how????

[Buckwild27]

6 hours ago, GMCustomerService said:

We are sorry to hear about this concern with your Silverado and would like to take the time to learn more. Please send us an email to [email protected]. Make sure to include your Username and Forum name in the subject line with additional details. We look forward to your email. 

Indeed! I would like to know the answer to @mikeyk101 question as well.

[AA24]

https://www.chevytalk.org/fusionbb/showtopic.php?tid/325999/

 

I recently stumbled on this and gave it a try however, this did NOT fix the issue...