A rejection of the contract would be a major setback for the U.A.W. president, Doug Jones, and the union’s other senior officials at a delicate moment. Before the strike, union leaders had come under heavy criticism from the rank and file over a federal corruption investigation in which several high-ranking officers have been charged with using union funds for lavish travel and personal purchases.

Many union locals have started planning informational meetings to explain the terms of the contract to members. Darlene Maddox, who was laid off when the Lordstown factory closed this year and accepted a transfer to Lansing, Mich., said she was very disappointed that her old plant wouldn’t be saved but wanted to know more before deciding how to vote.

“My first instinct is to vote no,” she said. “But the major highlights appear to be good.”

Others said they were encouraged that temporary workers would be able to become permanent employees with full benefits after three years of service.

Under current rules, temporary workers earn about $15 an hour, can be laid off at any time and have no dental or vision insurance.

Linda Castro, a temporary worker at a plant making sport utility vehicles in Spring Hill, Tenn., joined G.M. in January 2017, was laid off after a few months and more than a year later was recalled. She said she was worried that G.M. would lay off temporary workers before they could become full employees.