
2021 GMC Sierra 1500 AT4: Premium Diesel Power Meets Off-Road Capability
Built for drivers who demand serious work ethic without compromising on refined comfort, this 2021 GMC Sierra 1500 AT4 Crew Cab delivers rugged style and efficient performance. Whether handling heavy hauling tasks around Bean Station or heading off the beaten path for a weekend adventure, this four-wheel-drive truck brings unmatched confidence to every job. The striking Gray exterior paired with a Jet Black interior featuring Kalahari accents makes a bold impression wherever you travel. Take a moment to browse our used truck inventory to see how this Sierra AT4 stands out from the rest.
Rugged Performance & Diesel Capability
Under the hood, this Sierra AT4 is powered by a Duramax 3L I-6 direct injection, DOHC, variable valve control, intercooled turbo, diesel, engine with 277HP. Mated to a smooth-shifting 10-Speed Automatic transmission and Four Wheel Drive, this truck provides impressive low-end torque while achieving an EPA-estimated 22 MPG city and 26 MPG highway. Performance hardware includes an Off-Road Suspension equipped with Rancho shock absorbers, 2 underbody skid plates, and an Auto-Locking Rear Differential for maximum traction across challenging terrain. When it comes to trailering equipment, the ProGrade Trailering System works alongside the Integrated Trailer Brake Controller, Hitch Guidance w/Hitch View, and a 2-Speed Transfer Case with AutoTrac part and full-time 4WD. An Auxiliary External Transmission Oil Cooler and Engine Block Heater ensure reliable operation under heavy workloads. If you have a vehicle to trade toward this powerhouse, you can see what your trade is worth in just a few quick steps.
Advanced Technology & Cabin Comfort
Inside the spacious Crew Cab, premium materials blend with modern technology to create a elevated driving environment. The center of control is the Premium GMC Infotainment System featuring an 8 inch primary display touchscreen with Wireless Apple CarPlay/Android Auto smart device mirroring and Bluetooth handsfree wireless device connectivity. Drivers stay informed via the 4.2in Diagonal Color Display Driver Info Center, while passenger devices stay powered using 6 USB ports throughout the cabin. Everyday convenience comes easy thanks to Keyless Open & Start, a Remote Vehicle Starter System, a 120-Volt Instrument Panel Power Outlet, and a 120-Volt Bed Mounted Power Outlet. Front occupants enjoy Perforated Leather-Appointed Front Seat Trim with Heated Driver & Front Outboard Passenger Seating, Ventilated Driver & Front Passenger Seats, 10-Way Power Driver Seat Adjuster w/Lumbar, and a Heated steering wheel. You can easily start customizing your deal online to tailor this truck to your lifestyle.
Key Highlights
Discover the standout features equipped on this Sierra 1500 AT4:
- Duramax 3L I-6 Turbo Diesel Engine - Strong efficiency paired with 277HP performance.
- MultiPro Tailgate - Six versatile tailgate functions for effortless loading and bed access.
- Off-Road Suspension with Rancho Shocks - Trail-tested control and smooth ride quality.
- Spray-On Pickup Bed Liner w/AT4 Logo - Factory bed protection built to resist hard wear.
- ProGrade Trailering System - Advanced hitch guidance and integrated trailer brake control.
- Wireless Apple CarPlay & Android Auto - Seamless smartphone mirroring without messy cables.
- Heated and Ventilated Front Seats - Year-round seating comfort wrapped in premium leather.
- AutoTrac 2-Speed Transfer Case - Automatic four-wheel-drive engagement for any road condition.
Visit Us at Rusty Wallace Kia Morristown
Experience this capable 2021 GMC Sierra 1500 AT4 in person at Rusty Wallace Kia Morristown. Stop by our showroom to take a test drive, or give us a call at (423) 200-5335 to speak with our knowledgeable team. If you are ready to get started today, take a moment to get pre-approved for financing online and let us help you drive home in the ideal truck.

