The D Series was a line of pickup trucks sold by the Dodge division of American automaker Chrysler from 1961-1980. After 1980, the trucks were renamed the Dodge Ram and the same basic design was retained until the 1994 introduction of a completely redesigned Ram. The D Series shared its AD platform with the Dodge Ramcharger/Plymouth Trailduster twins. Another innovation was the introduction of an alternator rather than a generator for electrical power. A three-speed automatic transmission was a major advance — the truck used a two-speed automatic less than a decade earlier.