The United Auto Workers union tentatively agreed Wednesday to end a 5-day-old strike at a plant that builds one-third of General Motors Corp.’s full-size pickup trucks.

Members of UAW Local 594 will vote tonight on the tentative settlement. Neither union nor company officials would discuss the agreement.

The 5,500 UAW workers at GM’s Pontiac East truck plant and an associated engineering center went on strike Friday in a dispute over jobs for 1,500 workers whose positions were eliminated when GM closed a nearby plant.

The union wanted the company to create jobs for them at Pontiac East; the company wanted union approval to transfer them to other plants.

Production at Pontiac East could resume Friday if workers ratify the agreement this evening.