GMC Sierra 2500 HD grinding noise from rear and front suspension during deceleration and while in reverse on GMC Sierra 2500 HD

Some GMC Sierra 2500 HD owners report experiencing grinding noises from both the rear and front suspension during deceleration and while in reverse. This issue may be attributed to worn ring and pinion gears or improper gear setup, which can lead to a howl or whine during acceleration. Additionally, rumbling or whirring at speeds over 20 mph could indicate worn carrier bearings. If the noise remains consistent with speed and does not vary with turns or engine RPM, it may suggest problems with the rear end. Owners are also advised to check drivetrain fluids, as they may require changing after 40,000 miles. Furthermore, grinding noises could stem from wheel bearing failure in the rear, necessitating the replacement of both bearings and cleaning of the box/magnet. A thorough inspection of the vehicle's drivetrain components and suspension system is recommended to effectively address these concerns.