Hey, I know I'm super late to this but if anyone's still here was it ACTUALLY the tires? I have howling also and Chevy rebuilt my whole rear end, the noise seemed to stop or quiet down, then 500 miles later started doing it again. Mine is a 2022 with the rebuild being at 58k miles. I took it in and they said it's my tires and to wait until it gets louder, now it's louder and my warranty has obviously expired (60k power train) and they want to charge me for this even though it's their repair work that has failed