The first generation of Dodge Ram was introduced for the 1981 model year. The Ram was the successor to the Dodge D-Series, and was offered as a range of Light (100 & 150), Medium (250), and Heavy Duty (350) trucks. A selection regular, extended (Club), or crew cab body styles were offered, as well as inline six, V6, and V8 engine options. These trucks were offered in both rear wheel drive (which was denoted by the letter D, or the name Ram), and four wheel drive (which were denoted by the letter W, or the name Power Ram). The most notable engine fitted to the 1st Gen Ram was the Cummins 5.9L B Series diesel unit. This turbocharged inline six diesel engine was available starting in 1989 for the 250 and 350 Ram variants. When fitted with the 5.9L Cummins engine, these trucks are also commonly referred to as the 1st Gen Cummins. The first generation of Dodge Ram was in production until 1993, with the Second Generation Dodge Ram being introduced for the 1994 model year.