General Motors Co.’s three Hydra-Matic 6-speed transmission plants cumulatively hit the 1 million-unit production mark, with the auto maker’s South Korean subsidiary taking the honor of turning out the milestone unit. GM designs the transmission for global applications. Two of the transmission plants – Shanghai General Motors Co. Ltd. in Yantai, China, and General Motors de Mexico S.A. de C.V. in Sanluispotosi, Mexico – linked by teleconference to join in celebration as the designated ...

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