Unionized workers at General Motors are voting whether to accept a new contract with the auto giant. Unifor is holding votes Sunday in three Ontario communities; Oshawa, St Catharines and Woodstock. The union says results are expected late Sunday or early Monday morning. GM and Unifor hammered out the agreement last week. It includes wage increases, signing bonuses and lump sum payments, but the union also agreed that new hires will start with a defined contribution pension plan, rather than the hybrid plan for current employees. The company has also promised to invest in its Canadian operations. If the GM workers accept the proposed contract, Unifor will use it as a basis for negotiations with Fiat-Chrysler.