Ford will recall nearly three-quarters of a million vehicles in the US. A transmission problem may let vehicles move without driver input. The NHTSA says this is a major risk. Drivers could have no control even when they do nothing. Ford will mail owners how to resolve the problem. No crashes have been linked with this fault at this time. The recall does not cover every Ford vehicle. Only specific models with the defect are included. Ford has not given a timeline for fixes. Dealers will inspect and repair the problem at no cost. Owners should wait for a letter to see if their car is affected.