2020 Silverado 3500 SRW Diesel. The dealership has rotated the tires twice and done a front alignment which per the specs didn’t need to happen. The drone/humming sound seemed to be louder with a load on the truck, I pulled my 4500 lb boat last night, sound is most prominent between 60-65 mph, letting off the accelerator changes the pitch a little bit, no vibration at all, normal even tire wear. OEM tires Michelin LTX AT2, no modifications on the truck. My first report of the sound in March at 22,000 miles. The dealership has already had my truck for over a month and then gave it back to me. Stating my tires only need to be rotated per the service manager. Any help would be much appreciated.

 

Sounds like same issue I just started having. Sometimes it feels like the brake pads are dragging on the front rotors - I took the calipers off and cleaned up and checked everything - rotors seem fine. I can also describe it as a "road noise", and a "dragging/vibration" in the drivers sided floor board.

Getting tires rotated, but they look fine, just bought them 3 months ago.

Starting to think it may be the wheel hub assembly. Dealership say anything about the wheel hub assemblies?

 

Did you ever figure this out? I picked up a used 2019 Trail Boss and I notice a droning/hum sound specifically at 60-65. Other speeds it's smooth. My tires have been rotated and balanced.

 

negative, I only hear it when I'm rolling up to stop lights and stuff like that....

 

This might sound strange but check the fluid in the rear pumpkin, also check the backlash in the pinion gear. If the sound changes when you let off the gas, to me that's rear ring and pinion. Good luck.