Source: Pixabay The GMC Sierra is a powerhouse of a full-size truck, offering a premium off-roading experience and plenty of energy. Of course, no matter what car you purchase, there are sure to be issues that appear. Some of the worst to deal with are transmission troubles. If you love the GMC Sierra, you might wonder - are there GMC Sierra transmission problems? If you’re interested in learning more about the history of issues with the GMC Sierra’s transmission, you’re in the right place.