u/Available-Position-8

Got this 2015 Silverado RCSB 5.3 RWD at 42k miles from a dealership 2 weeks ago - just started making this noise. Vibration/flutter/shake above 20MPH and does it when I gradually press the pedal, and goes away with a “chirp” once the pedal goes all the way down. It makes this same chirp when I turn the engine on, or when I press hard/fast on the pedal. No check engine/ or transmission slips, or engine ticks. What is it? FYI it does it everytime I’m traveling faster than 30, and shakes when I make the gradual pedal press.