An F-150 pickup is assembled at a Ford plant in Dearborn, Mich., last year. Manufacturing has been a soft spot in recent months, with just 4,000 U.S. factory jobs added in April and none the month before.

An F-150 pickup is assembled at a Ford plant in Dearborn, Mich., last year. Manufacturing has been a soft spot in recent months, with just 4,000 U.S. factory jobs added in April and none the month before.