2003 GMC Sierra Unknown

Duramax diesel! - 2003 GMC Sierra 2500HD Ext Cab 143.5" WB 4WD SLT - Power Windows, Power Door Locks, Tilt Wheel, Remote Keyless Entry, Cruise Control, Steering Wheel Stereo Controls, Steering Wheel-Leather Wrapped, Security System, Engine Immobilizer/Vehicle Anti-Theft System, AM/FM Stereo, Cassette Player, CD Player, Tinted Glass - Deep, Additional Power Outlet(s), Air Conditioning, Climate Control - Auto, Climate Control - Dual, Bucket Seats, Seats-Front Bench-Split, Power Driver Seat, Floor Mats-Front, Vinyl Seats, Mirrors-Heated Driver, Mirrors-Pwr Driver, Mirrors-Heated Passenger, Mirrors-Pwr Passenger, Heated Side Mirrors, Mirror-Electrochromic In-Side Rearview, Wheels-Chrome, Transmission-Overdrive-Switch, Reading Lamps-Front, Running Boards, Towing Package, Bed Liner, Tonneau Cover, Air Bag - Driver, Air Bag - Passenger, Air Bag On/Off Switch - Passenger, Power Steering, Brakes-ABS-4 Wheel, 4 Wheel Drive, 4 Wheel Disc Brakes, Intermittent Wipers, Rear Defrost, Daytime Running Lights, Tow Hooks-Front