Spring Hill Manufacturing opened in 1990 and produced Saturn vehicles until March 2007. It produced the Chevrolet Traverse from September 2008 until November 2009, and the Chevrolet Equinox from September 2012 until October 2015. Currently, the site operations consist of a flexible vehicle assembly plant producing the Cadillac XT5 and the GMC Acadia, an engine plant making 4-cylinder engines, a stamping plant, a body shop, a paint shop and two polymer injection molding operations. Engines and stampings are supplied to various GM assembly plants globally. The complex will begin building small block V8 engines by the end of 2016.

Bay City Powertrain produces engine components that are used in Chevrolet, Buick, GMC and Cadillac vehicles.  The plant opened in 1892 as National Cycle Manufacturing Company and produced a new bicycle to replace old high-wheeled types.  In 1916, William Durant and Louis Chevrolet bought the plant and the plant was added to the General Motors portfolio in 1918.  With this investment, GM has invested or will invest $249.4 million in Bay City Powertrain since 2010.

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