Drivability Question

nocturnalmotors · May 31, 2022

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 May 31, 2022 by nocturnalmotors

Another JR · May 31, 2022

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 · May 31, 2022

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

MTU Alum · June 1, 2022

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 June 1, 2022 by MTU Alum