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Drivability Question

nocturnalmotors

By nocturnalmotors
in 6.6L Gas V8 (L8T)

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nocturnalmotors Enthusiast

nocturnalmotors

Posted
Posted (edited)

2022 Chevy 3500HD LT SRW CC 8k miles. I'm noticing a vibration under load when "lugging" at the bottom of 3rd gear, mostly. It's felt in the pedal and floorboard. It goes away once the RPM's rise.

 

Also, when going constant ~35-55mph unloaded and accidentally hit the accelerator from a bump (can do on purpose too), the exhaust makes a very noticeable booming noise from under the cab. It does this also with cruise control set and bumping up the speed each MPH on the wheel control. (Boom, boom, boom as you +1 mph for 3 times for example)

 

Just checking if others experience these? Normal?

Edited by nocturnalmotors
Another JR Senior Enthusiast

Another JR

Posted
Posted

I don’t think I’ve felt vibration like that. I definitely do not have the boom sounds you describe. Mine is a 2021. 

sheath Enthusiast

sheath

Posted
Posted

My truck doesn't do that either.  Empty or loaded/towing.  Might be worth checking with the dealer.

MTU Alum Enthusiast

MTU Alum

Posted
Posted (edited)

Dealer can put picoscope on seat track and determine which component is causing the vibration.  It maybe how the trucks are but they can see if something isn't right.  You can get some drones when torque converter is locked and you are lugging the engine.

 

#iworkforGM

Edited by MTU Alum
  • 2 weeks later...

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