Introduced in April 1987 as 1988 models (known as the GMT400), there were 10 different versions of the C/K line for 1988: Fleetside, Fleetside Extended Cab, Fleetside W/T, Sportside, and Sportside Extended Cab, each in either 2WD (C) or 4WD (K) drivelines. Engines were a 160 hp (119 kW) 4.3 liter V6 or a 126 hp (94 kW) 6.2 liter V8. A 230 hp (172 kW) 7.4 liter V8 came in 1990, and a 175 hp (130 kW) 5.0 liter V8 added in 1994. All engines for more power of 40 to 40 hp (30 to 45 kW) in 1996, and a 6.5 liter 180 hp (134 kW) V8 added in 1997. 3- and 4-speed automatic transmissions were offered, with the 3-speed dropped and a 5-speed manual transmission added in 1992.