GM to add third shift in Tennessee, plans Holden version of GMC Acadia GM to add third shift in Tennessee, plans Holden version of GMC Acadia April 25, 2018 dzadmin Comments 0 Comment GM plans to reinstate a third shift at its assembly plant in Tennessee to meet growing demand in the United States for crossovers and add production of an all-new Holden version of the GMC Acadia.