GMC Acadia shaking issue at 40 to 45 mph on GMC Acadia

Some GMC Acadia owners report experiencing shaking issues at speeds between 40 to 45 mph, which may be caused by unbalanced or misaligned wheels, tire damage, bent rims, bad wheel bearings, or loose lug nuts. This vibration is often more noticeable in the back of the vehicle, felt in the seat rather than the steering wheel. Additionally, if the shaking is specifically felt around 45 mph and throughout the vehicle, including the accelerator, it could indicate problems with the wheels or tires. Some owners also report experiencing transmission shudder, which can lead to vibrations at 50-60 mph when maintaining speed with light throttle input. It is crucial for owners to address these potential issues systematically to effectively diagnose and resolve the shaking problem.