American Axle & Manufacturing Holdings Inc. (AAM) is investing more than $100 million in its Three Rivers Manufacturing Facility in Three Rivers, Mich. The investment, which will be completed by December 2013, is expected to create more than 500 new jobs while further diversifying AAM's product portfolio and customer base in North America. The investment includes the installation of new production lines, multiple assembly stations, paint-line modifications and additional shipping and receiving capacity. Last year, AAM invested more than $50 million in Michigan to update machining and R&D laboratory equipment and more.