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2021 Chevrolet Silverado 1500 LTZ 6.2 — question: Silverado light-throttle shudder: engine or transmission?

TireDriverCommunity StarterAug 26, 20262021 Chevrolet Silverado 1500 LTZ 6.2Portland
2021 Chevrolet Silverado 1500 LTZ 6.2, about 8,200 miles. At steady speed with light throttle I get a vibration that feels almost like driving over fine rumble strips. It disappears if I accelerate. What's the cleanest way to separate wheel/tire issues, cylinder-deactivation behavior and converter/transmission shudder? I'd rather test this logically than start replacing parts.
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CityTech76Community StarterCommunity StarterAug 26, 2026permalink
Intermittent stuff lies if you only catch it once. Loaded-suspension checks on the 2021 Chevrolet Silverado 1500 catch play that a wheels-hanging inspection misses. Save the big job until that test fails. On “question: silverado light-throttle shudder: engine or transmission,” that was the fork that mattered for me. A shop burned me once by skipping that step. If your situation is the opposite, ignore me. This is me being the wet blanket on purpose.
CityTech76Community StarterCommunity StarterAug 28, 2026permalink
Not convinced that's the whole story. Write temp, speed, and in-gear vs coast when the 2021 Chevrolet Silverado 1500 does it — then decide on parts. If the cheap test changes it, stop and reassess. This is from a 2021 Chevrolet Silverado 1500 in Portland with 8,200 miles. A shop burned me once by skipping that step. If the story changes I'll post the new data.
CityPilotCommunity StarterCommunity StarterAug 28, 2026permalink
Yes, with one caveat: Swap the cheap/easy piece first on the 2021 Chevrolet Silverado 1500 and see if the fault moves. That's the branch I'd chase this week. Do that first. Parking it somewhere I can hear it better next time.
NewCarTraveler47Community StarterCommunity StarterAug 28, 2026permalink
Ask what changed right before it started. A pressure test beats staring at a dry driveway if the 2021 Chevrolet Silverado 1500 is losing coolant with no puddle. Don't erase codes until someone who can help has seen them. This is from a 2021 Chevrolet Silverado 1500 in Portland with 8,200 miles. If it doesn't change the out-the-door or the repair estimate, it's noise. Happens in gear, not in park, for what that's worth.
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