This 2021 GMC Sierra 1500 AT4 in striking red delivers the capability and comfort you expect from a premium truck, with the refinement that sets it apart.
- 3.0L I6 engine with 10-speed automatic transmission and 4WD
- Premium GMC Infotainment System with Apple CarPlay and Android Auto
- SiriusXM with 360L satellite radio
- Perforated leather-appointed front seats with heating and ventilation
- 10-way power driver and passenger seats with lumbar support
- Heated steering wheel
- Spray-on pickup bed liner with AT4 logo
- ProGrade Trailering System with integrated trailer brake controller
- Auto-locking rear differential with hill descent control
- Off-road suspension tuned for AT4 performance
- Dual-zone automatic climate control
- Remote vehicle starter system and keyless open and start
- 18-inch machined aluminum wheels
- HD rear vision camera with hitch guidance
The AT4 package transforms this Sierra into a truck built for serious work and adventure. The 3.0L I6 engine delivers dependable power while returning an impressive 22 city and 26 highway mpg, balancing performance with efficiency on every drive.
Inside, the carefully appointed cabin reflects GMC's commitment to quality. Perforated leather seats with heating and ventilation keep you comfortable in any season, while the 10-way power adjustable driver's seat with lumbar support accommodates your preferences. The heated steering wheel adds another layer of comfort during cold mornings, and the dual-zone automatic climate control ensures both driver and passenger stay satisfied.
The bed is equipped with a spray-on liner bearing the AT4 logo, protecting your cargo while maintaining the truck's rugged aesthetic. The ProGrade Trailering System includes an integrated trailer brake controller and hitch guidance with hitch view, making towing straightforward and secure. Red recovery hooks stand ready for off-road situations.
Technology keeps you connected and in control. The premium GMC Infotainment System integrates Apple CarPlay and Android Auto, while SiriusXM with 360L keeps entertainment flowing. The 4G LTE Wi-Fi hotspot capability ensures you stay linked to what matters. An HD rear vision camera provides confidence when backing, and the in-vehicle trailering app puts towing information at your fingertips.
Safety and control are engineered throughout. Four-wheel disc ABS brakes, electronic stability control, and traction control work together with hill descent control and the auto-locking rear differential to keep you secure whether you're navigating highways or challenging terrain. Multiple airbags, including dual front-side and overhead protection, provide comprehensive occupant safety.
With just over 44,000 miles, this Sierra AT4 has been well cared for and is ready for the next chapter of capable ownership. Come experience how this truck combines work-ready toughness with the refinement and technology that make every drive enjoyable.
Used 2021 GMCSierra 1500 AT4
- Diesel
- Exterior Color
- Cardinal Red
- Interior Color
- 4SB--Leather, Jet Black / Kalahari, Interior Trim
- Odometer
- 44,454 miles
- Fuel Economy
- 14/19 MPG City/Hwy
- Transmission
- Automatic
- Drivetrain
- 4WD
- Engine
- Engine: Duramax 3.0L, Turbo-Diesel, Inline 6 Cylinder
- VIN
- 1GTU9EET7MZ343123
- Stock Number
- P3650
GMC
Sierra 1500
Included Packages & Accessories
Detailed Specifications
- Max seating capacity: 5
- Fuel System: Direct Injection
- Fuel tank capacity: 24 gal
- Horsepower: 277
Dealer Notes
Disclaimer:
The Manufacturer’s Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Dealer sets final price.
1Dealer Discount applied to everyone
1Dealer Discount applied to everyone
- Asking Price
- $41,127
- Doc Fee
- $698
- Price
- $41,825
- We're here to help: (918) 981-3233
- We're here to help: (918) 981-3233




