TransmissionDIYCommunity Starter

Silverado light-throttle shudder: engine or transmission?

SmoothHunterCommunity StarterOct 24, 20252021 Chevrolet Silverado 1500 LTZ 6.2San Diego
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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BatteryWrenchCommunity StarterCommunity StarterOct 25, 2025permalink
If it were in my driveway, if a shop can't duplicate it on the 2021 Chevrolet Silverado 1500, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. This is from a 2021 Chevrolet Silverado 1500 in San Diego with 8,200 miles. Parts cannon is a personality type I try to avoid. Parking it somewhere I can hear it better next time.
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