How Does GM Meet Capacity Issues? Simple...Use Shuttles��TheGMSource - What do you do when you\'re product is so hot that you\'ve already added a third shift to help address demand issues and it doesn\'t seem to work? Do you build a new plant? Do you add capacity and retool another plant? GM says both ideas would take too much time to implement, and has come up with an idea that has added capacity for 60,000 to 80,000 new vehicles and the idea only took months to implement.