Originally introduced in 1994, this truck has been refined and upgraded for the past five years. Recent changes include more powerful engines, better fuel economy, improved suspensions and a greater selection of options, including a third door.

For 1999, the Sonoma comes with a Next Generation driver's airbag. Heated power mirrors are now available and all exterior mirrors have been redesigned and enlarged for improved rearward vision. Insta-Trac is now standard on all 4x4 models; just a touch of a button engages the shift-on-the-fly four-wheel-drive system. Composite skid plates are optional. An anti-theft alarm and flash-to-pass feature were added this year.

GMC offers a huge selection of options with two- and four-wheel-drive models, regular and extended cab bodies, short and long beds, seven different chassis packages and SL, SLS and SLE trim levels.