TSB: Chevy Truck Squeak

This bulletin applies to 2019 Chevy Silverado 1500 (new model), 2020-2021 Silverado 1500, 2021 Suburban, 2019 Sierra 1500 (new model), and 2020-2021 Sierra 1500 vehicles. A squeak or chirp noise may be evident in 2WD that goes away when in 4WD. The noise may be described as a metallic jingle, ringing, click or ting at the front of the vehicle. The condition is easiest to duplicate in warmer ambient temperatures after about 30 miles of driving. 
The condition may be caused by a left side front axle. Replace with P/N 87821660.