The National Highway Traffic Safety Administration is investigating about 1 million more Fiat Chrysler trucks and SUVs after drivers reported the vehicles can roll away after their gearshifts are placed in park. The agency said in documents posted on its website that it has received 43 complaints about 2013-16 Ram 1500s and 2014-16 Dodge Durangos that allege the vehicles roll away after being shifted into a “parked position.” The reported faulty gearshifts have been linked to nine injuries and 25 crashes, according to federal regulators.