A United Automobile Workers union vote on a tentative contract agreement with General Motors that provides record wage increases has run into unexpectedly strong resistance from veteran workers, the New York Times reported. Voting at most union locals has been completed and the final result, due as early as Thursday evening, will very likely be decided by a narrow margin. A majority of workers at several large plants in Michigan, Indiana and Tennessee rejected the contract, though union members at a large sport utility plant in Arlington, Texas, voted in favor of it. G.M., Ford Motor and Stellantis agreed to similar contracts with the union after U.A.W. members went on strike at select plants and warehouses. Workers walked off the job at the first three plants on Sept. 15 and stayed on strike for more than 40 days. It was the first time the union has struck all three automakers at the same time, though it did not shut down all of the factories of any company. The agreement appears to be headed for ratification at Ford and Stellantis, the maker of Chrysler, Jeep and Ram vehicles, by comfortable margins, according to running tallies the U.A.W. published online. At G.M., many veteran workers have opposed the contract because they want the company to contribute more money to retirement plans and the cost of health care for retirees.