CINCINNATI (Reuters) - The union representing autoworkers at the General Motors Corp truck plant in Moraine, Ohio, said on Tuesday it will fight plans to close the assembly plant, one of four on the chopping block.

Gaylen Turner, president of IUE-CWA Local 798 representing some 2,300 current workers at the Moraine plant, said GM's decision to shutter the plant, announced earlier on Tuesday, was not a surprise but would be opposed by the union.

"We anticipate having additional meetings, sitting down and talking about contractual issues, meeting with the international union to see where we go from here and what can be done," Turner said.

"Never never means never. Until they tell me there is no other chance, I'm going to continue to fight to do what we can do to keep the place open. I'm going to fight as long as I can," he added.

He said the Detroit automaker's decision to close the Moraine plant is sad but not unanticipated, since it was already being downsized and lacked product plans after 2010.

"I don't know if you're ever ready for it. People understood that it was something that could happen. But you always hold out hope," Turner said.

GM said on Tuesday it was closing four truck plants and could sell its Hummer brand to cut its output of slow-selling trucks and SUVs in response to higher gasoline prices that the automaker now sees as a permanent threat to its business.

The Moraine plant makes GM's Envoy, Trailblazer and Saab models. As of Monday, more than 300 workers had accepted "special attrition packages," Turner said.

Tony Curington, a union representative for displaced workers in the area, said the plant closing would only add to an already stressed economy.