DETROIT – The United Auto Workers union reached a tentative four-year contract with Chrysler Wednesday, hours after going on strike and the same day General Motors workers ratified a separate four-year pact. Next up: Ford. A person with knowledge of the Chrysler LLC agreement said it includes some guarantees that vehicles will be produced at U.S. factories, a company-funded union-run trust that will pay much of Chrysler’s $18 billion in long-term retiree health care costs, and a lower wage scale for some newly hired workers. The person, who requested anonymity because the contract has not been ratified by union members, said the new vehicle guarantees are not as extensive as those given by General Motors Corp. Gettelfinger wouldn’t release any details of the contract, but Chrysler said the tentative agreement includes the retiree health care trust. The newly private company didn’t say how much money it will contribute to the trust. “The national agreement is consistent with the economic pattern and balances the needs of our employees and company by providing a framework to improve our long-term manufacturing competitiveness,” Chrysler Vice President and Chairman Tom LaSorda said in a statement. Chrysler’s national UAW contract covers about 45,000 workers and 78,000 retirees and spouses. Brett Ward, a material handler at Chrysler’s Sterling Heights assembly plant, said Wednesday night he had not been given details of the agreement. But he feared that it would have a lower-tier wage structure for new hires that was similar to what the union negotiated with GM. In the next contract, he’s afraid Chrysler will negotiate wages downward for all workers similar to a deal between the UAW and troubled auto parts supplier Delphi Corp. “They made it one tier again, but a much lower, undesirable one,” said Ward, a member of Soldiers of Solidarity, a group often critical of the union. Kevin Bork, a senior designer at a Chrysler technical center, said his primary concerns are health care and stopping the outsourcing of jobs. “I’m very happy that the strike didn’t last very long and we’ll all be returning to work,” he said. “Now it’s just a matter of seeing what the offer is.” The UAW said its historic contract with GM, which also includes a retiree health care trust, was approved by 66 percent of production workers and 64 percent of skilled trades workers.160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! AD Quality Auto 360p 720p 1080p Top articles1/5READ MOREGame Center: Chargers at Kansas City Chiefs, Sunday, 10 a.m.The guarantees, which translate into job security for union workers, are in many cases only for the life of current products, the person said. GM made guarantees at many factories that include the next generation of cars, trucks and parts. The new lower wage scale, the person said, covers new hires who would replace Chrysler Mopar parts transportation workers. Buyout and early retirement offers would be made to current workers in an effort to get them to leave, the person said. The lower wage scale is similar to the one negotiated by GM, the person said. UAW President Ron Gettelfinger said the strike against Chrysler, which is 80.1 percent owned by private equity firm Cerberus Capital Management LP, would end immediately and workers should report for their next available shift. “This agreement was made possible because UAW workers made it clear to Chrysler that we needed an agreement that rewards the contributions they have made to the success of this company,” Gettelfinger said in a statement.