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Are these noises normal?

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Old Apr 18, 2024 | 12:55 PM
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Default Are these noises normal?

So the first one is this subtle knocking sound when I’m in drive or reverse either stopped or moving slow. The 2 video clips in the garage capture the sound but you have to listen closely to hear it.

Second one I started noticing more since doing a muffler delete is a warbling noise sometimes when accelerating or decelerating​​​​​. You can hear in the beginning and end of the clip of me driving on the highway.

Lastly I’ve noticed quite a bit of studdering (feels like I’m driving on sticks) when accelerating usually within 1.5k-2k RPMs in manual mode (I only drive in manual mode since I don’t have a range device yet). Is this a symptom of transmission shudder? The transmission was completely replaced by a reputable dealer in 2021. I’m not sure if they did a triple flush or not though.
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Old Apr 19, 2024 | 01:38 PM
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Here's a GM service bulletin about normal noises for these cars, and others...


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