A full-size, heavy-duty pickup truck, the 1998 GMC Sierra 2500 comes standard with a powerful engine and transmission to help with tough jobs. The standard engine is a 5.0L V8 engine that produces 230 hp and 285 lb-ft of torque. The base transmission is a heavy-duty five-speed manual while a four-speed automatic is available. The Sierra 2500 is available with RWD or 4WD.