DETROIT: General Motor's labor woes continued as the United Auto Workers went on strike today at a key plant which manufactures transmission for most GM vehicles made in North America. The walkout, the sixth this year, involves 2,800 member of UAW Local 909 from the automaker's Warren, Michigan facility. The workers are upset at company plans to transfer wheel-making operations from the Warren plant and replace them with work from the Buick City plant in Flint, which the automaker may shut down within months. Although talks are expected to resume today, GM officials fear that the strike could force its North American assembly plants to temporarily close shop by Friday. But it wasn't all bad news for GM today. At the company's Delphi Interior & Lighting Systems plant in Anderson, Indiana, a strike deadline was extended for the second time after a tentative agreement on a contract dispute was reached. Negotiators are scrambling to resolve snags on production speedups and workplace safety requirements.