ALL VEHICLES SUBJECT TO A $225 DEALER DOC FEE. USED VEHICLES PRE-LOADED WITH OUR OPTIONAL VIP PACKAGE FOR $2995. THIS INCLUDES 1 YEAR OIL CHANGES AND TIRE ROTATIONS. ONE YEAR INTERIOR AND EXTERIOR PROTECTION. 1 YEAR THEFT PROTECTION. LIFETIME POWERTRAIN WARRANTY* SOME EXCLUSIONS APPLY TO THE LIFETIME WARRANTY
- Front dual zone A/C
- Electronic cruise control with set and resume speed
- Fully automatic headlights
- Heavy-duty rear locking differential
- External engine oil cooler
- External transmission oil cooler
- Trailering hitch platform
- Leather power-reclining front bucket seats with heated cushion backs and driver-side memory
- Power-folding heated exterior mirrors with auto-dimming driver side
- HD handling and trailering suspension package
This 2003 GMC Sierra 2500HD SLT 4WD represents serious workhorse capability in white with a pewter interior. Powered by a Duramax 6.6L V8 Turbodiesel engine paired with an Allison 1000 5-speed automatic transmission, this extended cab long box is built to handle demanding jobs and towing assignments. With a clean CarFax and genuine four-wheel-drive performance, this Sierra delivers the reliability and punch diesel buyers demand.
The SLT Preferred Equipment Group elevates comfort and capability with leather seat inserts, six-way power adjustable seating, dual inboard armrests, and an overhead console. Heavy-duty trailering equipment, skid plate protection, and an electronic shift transfer case ensure this truck is ready for work or weekend adventures. Stop by to experience the engineering and toughness this proven platform delivers.
Used 2003 GMCSierra 2500HD SLT 4WD
- Exterior Color
- Summit White
- Interior Color
- Pewter
- Odometer
- 253,172 miles
- Transmission
- Allison 1000 5-Speed Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- Bed Length
- 8.1 ft
- VIN
- 1GTHK29143E121237
- Stock Number
- 3E121237A
Highlighted Features
- Front dual zone A/C
- Fully automatic headlights
Included Packages & Accessories
- HD Handling/Trailering Suspension Package
- Heavy-Duty Trailering Equipment
- Skid Plate Package
- AM/FM radio
- ETR AM/FM Stereo w/CD/Seek & Scan
- Air Conditioning
- Electric Rear-Window Defogger
- Front dual zone A/C
- Power steering
- 4-Wheel Disc Brakes
- ABS brakes
- Dual front impact airbags
- Front anti-roll bar
- Front wheel independent suspension
- Passenger cancellable airbag
- Power Programmable Door Locks
- Fully automatic headlights
- Electronic Cruise Control w/Set & Resume Speed
- Heavy-Duty Rear Locking Differential
- Engine Block Heater
- External Engine Oil Cooler
- External Transmission Oil Cooler
- Bumpers: chrome
- Chrome Grille Surround
- Front License Plate Bracket
- Rear Chrome Step Bumper w/Pad
- Rear step bumper
- Spare Tire Lock
- Driver door bin
- Passenger vanity mirror
- Tachometer
- Tilt steering wheel
- Voltmeter
- 40/20/40 Front Split-Bench Seat
- Front Center Armrest w/Storage
- Passenger door bin
- Trailering Hitch Platform
- 16" x 6.5" Chrome-Styled Steel Wheels
- Solar-Ray Deep Tinted Glass
- Variably intermittent wipers
- Clean CarFax
Detailed Specifications
- Air conditioning
- Driver door bin
- Front beverage holders
- Front dual zone A/C
- Passenger door bin
- Passenger vanity mirror
- Rear beverage holders
- Rear door bins
- Tilt steering wheel
- Front anti-roll bar
- Front tires: 245/75SR16.0E
- Front wheel independent suspension
- Power steering
- Rear tires: 245/75SR16.0E
- Single rear wheels
- Wheel size: 16"
- AM/FM radio
- Speakers: 4
- Front center armrest: w/storage
- Rear seats: bench
- Rear seats Folding position: fold-up cushion
- Cylinder configuration: V-8
- Drive type: four-wheel
- Engine location: front
- Fuel tank capacity: 34.0gal.
- Mode select transmission
- Sequential multi-point fuel injection
- Ground clearance (max): 345mm (13.6")
- Ground clearance (min): 269mm (10.6")
- Bumpers: chrome
- Rear cargo: tailgate
- Rear step bumper
- Exterior body width: 2,024mm (79.7")
- Exterior height: 1,935mm (76.2")
- Exterior length: 6,264mm (246.6")
- Front headroom: 1,041mm (41.0")
- Front hiproom: 1,560mm (61.4")
- Front legroom: 1,049mm (41.3")
- Front shoulder room: 1,656mm (65.2")
- Rear headroom: 975mm (38.4")
- Rear hiproom: 1,562mm (61.5")
- Rear legroom: 856mm (33.7")
- Rear shoulder room: 1,684mm (66.3")
- Turning radius: 7.7m (25.4')
- Wheelbase: 4,001mm (157.5")
- Display: analog
- Fully automatic headlights
- Oil pressure gauge
- Tachometer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Dual front impact airbags
- Ignition disable
- Passenger cancellable airbag
Dealer Notes
KBB.com Consumer Reviews
- 5.0
Great work truck
By Redman996 on 3/5/2026 8:55:29 PM
Great truck and very reliable only problems I had with it the hydrovac brake system it would make the power steering pump go out or crack the container that holds the power steering fluid. Great truck for pulling and had power and speed and great handling. - 5.0
Keep me trucking
By Elik on 11/9/2025 1:46:06 AM
I have a 2003 GMC serria extended cab 6.5ft bed stepsister V8 well taken care of best truck I have ever had replaced brake lines and radiator don't use any oil between changes very good shape - 5.0
22 Years Old and Still Awesome
By Robert on 8/7/2025 3:10:01 PM
I paid cash for my silver birch metallic 2004 GMC Sierra 1500 SLT Z71 crew cab in February 2025 with 94k original miles. 5.3L Vortec, Z71 offroad package, Z82 towing package, G80 locker, 3.73 gear ratio, heated leather seats, Bose sound system, Line-X spray-in bedliner, push-button 4x4, etc...all the good stuff. No rust on the body of the truck (rare in my area!) and typical surface rust on the frame. Truck was purchased at a small local dealership with a valid state inspection certificate. Absolutely love the truck. It's smooth, powerful, quiet, mechanically sound and fun to drive. Yeah, it's not perfect. I've had to put some money into it (air conditioning, tune-up, cosmetic stuff, etc.) to keep it performing at it's best and will continue to (driver seat repairs, shuddering 4L60E transmission with cruise control engaged, etc.)...but it's still way better than a $600+/monthly truck payment. In fact, I've been driving for 20 years and have never made a monthly payment on a vehicle before. I've had 3 GMT400s, which I liked, but this GMT800 is, objectively speaking, a better truck. Let's see if it can last another 22 years!