2023 Chevy Suburban – Rattle at Highway Speeds (Looking for Insight)

Hey everyone, hoping to get some experienced input on a rattle I’ve been chasing on my 2023 Chevy Suburban.

I’ll attach a video so you can hear it.

What I’m Hearing

• Metallic rattle / chatter
  
• Sounds like it’s coming from the front driver side, almost like it’s near the driver-side dash speaker, but I know sound can travel
  
• Only happens while driving 60+ MPH
  
• Doesn’t happen at idle, low speeds, or revving in park
  
• Couldn’t be consistently heard while the truck was on a lift
  

Timeline (Important)

• I had a transmission fluid flush and engine mounts replaced first — no noise after that
  
• The rattle started after torque converter work was done and has been there since
  

Because of the timing, I don’t think this is suspension or exhaust related.

What’s Been Checked So Far

• Put on a lift by my mechanic
  
• Exhaust and heat shields checked
  
• Suspension checked
  
• Nothing obvious found
  

What I’ve Narrowed It Down To

Based on the symptoms and feedback I’ve gotten, these seem like the most likely areas:

• Torque converter bolts / dust shield / flexplate area
  
• Starter drive (Bendix) possibly engaging or vibrating
  

Both seem like things that might only show up under load at highway speeds and not on a lift.

What I’m Hoping For

• Anyone who’s dealt with a similar GM truck/SUV rattle at highway speed
  
• Confirmation I’m looking in the right area
  
• Anything commonly overlooked on these trucks
  

I’m trying to avoid throwing parts at it and just want to focus on the right stuff next.

Thanks in advance.

(Video attached below)

📌 Video Note

Phone was resting on the driver-side dash speaker while recording — mic placement doesn’t mean that’s the source.

 

Welcome to Chevy - are you still under warranty?

 

nope, I have 130k miles