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FLINT, MICH. — General Motors Co. plans to invest $150 million at its Flint assembly plant to increase production of the all-new Chevrolet Silverado and GMC Sierra heavy-duty pickup trucks, which begin shipping to dealers this week. This is the second major expansion of GM’s full-size pickup truck production capacity this year. The news follows GM’s announcement last month to expand light-duty, full-size pickup truck production capacity in Fort Wayne, Ind. GM has invested more than $1.6 billion in the Flint assembly plant since 2013. The work will be completed in the first half of 2020. The Flint plant opened in 1947 and currently has three production shifts.