Subaru of America says it has suspended overtime at its plant in Lafayette, Ind. The plant, Subaru's only North American factory, employs 3,500 workers and built 150,000 vehicles last year, including the Outback and Tribeca wagons and Legacy sedan.
Toyota is suspending overtime and production on Saturdays at all of its North American plants to assess the availability of car parts.
Both automakers are trying to conserve parts after the huge earthquake and tsunami, which is disrupting shipments from Japan to the U.S.
Japanese automakers Nissan and Honda say their North American plants have not been affected so far.