Used 2021 GMC Sierra AT4

Stock: 297724BVIN: 3GTP9EEDXMG202391

Stock: 297724B VIN: 3GTP9EEDXMG202391

Used 2021 GMC Sierra AT4

Detailed Pricing
Red River Price:
$40,800
Dealer Processing Fee:
$129
Red River Price:
$40,929
View Window Sticker

Vehicle Highlights

Overview
297724B
Stock
3GTP9EEDXMG202391
VIN
70,930
Miles
Truck
Body
4X4
Drivetrain
Satin Steel Metallic
Exterior
Jet Black w/Kalahari Accents
Interior
147.4
Wheelbase
V8, 5.3L
Engine
Gas
Fuel
10-speed automatic
Transmission
4
Doors
21*
Highway MPG
16*
City MPG
Crew Cab
Cab Type
Description
Vehicle Details
Elevate your driving experience with this rugged 2021 GMC Sierra 1500 AT4 - a bold, capable 4WD truck with a powerful V8 5.3L gasoline engine, now available in Heber Springs, AR. Built for drivers who demand comfort, performance, and off-road readiness, the AT4 trim pairs serious capability with refined features that make every trip more enjoyable. Equipped with the Off-Road Package, this GMC Sierra is ready to tackle rough terrain with confidence. The suspension and protective underbody components enhance trail durability while maintaining on-road composure. Inside, Automatic Climate Control creates a consistently comfortable cabin environment, while Remote Start adds convenience and readiness in any season. The heated steering wheel keeps your grip warm on cold mornings, and Android Auto integrates your smartphone for seamless navigation, music, and hands-free communication. This GMC Sierra 1500 AT4 delivers a commanding presence with its rugged exterior styling and functional design cues tailored to off-road performance. Heavy-duty construction, smart storage solutions, and thoughtful technology make it an ideal choice for outdoor enthusiasts, contractors, and everyday drivers seeking versatility. Located in Heber Springs, AR, this truck is ready for test drives and adventures across town or off the beaten path. Reliable, well-equipped, and built for action - this 2021 GMC Sierra 1500 AT4 is prepared to take on your next mission. Contact us to schedule a viewing and experience its capability firsthand.

Equipment
Start the GMC Sierra from inside with remote start. This 1/2 ton pickup offers Apple CarPlay for seamless connectivity. The leather seats in the vehicle are a must for buyers looking for comfort, durability, and style. This GMC Sierra offers Automatic Climate Control for personalized comfort. The GMC Sierra offers Android Auto for seamless smartphone integration. An off-road package is installed on this GMC Sierra so you are ready for your four-wheeling best. The GMC Sierra features a hands-free Bluetooth phone system. It is pure luxury with a heated steering wheel. This 2021 GMC Sierra 1500 features steering wheel audio controls. See what's behind you with the back up camera on this 2021 GMC Sierra 1500. This vehicle is outfitted with an OnStar communication system. A trailer braking system is already installed on the GMC Sierra. When you encounter slick or muddy roads, you can engage the four wheel drive on the vehicle and drive with confidence.

Packages
Preferred Equipment Group 4SB: HD Rear Vision Camera; LED Cargo Area Lighting; Remote Vehicle Starter System; 2 USB Ports (1st Row); Hill Descent Control; Electric Rear-Window Defogger; Floor-Mounted Center Console; Theft Deterrent System (unauthorized Entry); Body-Color Surround Grille; 170 Amp Alternator; Auxiliary External Transmission Oil Cooler; Heavy-Duty Air Filter; Skid Plates; Compass; 4.2" Diagonal Color Display Driver Info Center; Electrical Lock Control Steering Column; Trailering Package; 120-Volt Instrument Panel Power Outlet; Heated Driver and Front Outboard Passenger Seating; Off-Road Suspension; Front Premium Floor Liners with Removable Carpet Insert; Steering Wheel Audio Controls; GMC Connected Access Capable; Color-Keyed Carpeting Floor Covering; OnStar and GMC Connected Services Capable; Power Front Passenger Windows with Express Up/down; 2-Speed Transfer Case; Deep-Tinted Glass; Spray-On Pickup Bed Liner with AT4 Logo; Premium GMC Infotainment System Radio with Multi-Touch; Power Rear Windows with Express Down; Red Recovery Hooks; Integrated Trailer Brake Controller; Power Front Windows with Driver Express Up/down; Ventilated Driver and Front Passenger Seats; 18" X 8.5" Machined Aluminum Wheels; Manual Tilt-Wheel and Telescoping Steering Column; Rear Dual USB Charging-Only Ports; Keyless Open and Start; 4G LTE Wi-Fi Hotspot Capable; ProGrade Trailering System; Rear Wheelhouse Liners; 12-Volt Rear Auxiliary Power Outlet; 2 USB Ports; Auto-Locking Rear Differential; Power Door Locks. Satin Steel Metallic. LT275/65R18C MT BW Tires. **Equipment listed is based on original vehicle build and subject to change. Please confirm the accuracy of the included equipment by calling the dealer prior to purchase.**
Features
Apple CarPlay

Apple CarPlay

Bed Liner

Bed Liner

Brake Assist

Brake Assist

Ventilated Seats

Ventilated Seats

Fog Lights

Fog Lights

Heated Seats

Heated Seats

Heated Side Mirrors

Heated Side Mirrors

Keyless Entry

Keyless Entry

Leather Seats

Leather Seats

Memory Seats

Memory Seats

Power Seat

Power Seat

Power Windows

Power Windows

Premium Audio

Premium Audio

Push Button Starting

Push Button Starting

Rearview Camera

Rearview Camera

Satellite Radio

Satellite Radio

Security System

Security System

Side-Impact Air Bags

Side-Impact Air Bags

Stability Control

Stability Control

WiFi Hotspot

WiFi Hotspot

Remote Start

Remote Start

Tow Hitch

Tow Hitch

Heated Steering Wheel

Heated Steering Wheel

Details
Model Overview
The GMC Sierra 1500 comes in six different drivetrain configurations and one of five distinct body styles - regular cab with a long or standard bed, crew cab with a short or standard bed, and double cab with a standard bed. Beyond that, the 1500 can be equipped with configurations that include a 4.3L V6 that produces 285 horsepower, a 2.7L turbocharged 4-cylinder that makes 310 horsepower and 348 pound-feet of torque, a 5.3L V8 making 335 horsepower and 383 lb.-ft of torque and finally, a 3.0L inline-6 cylinder turbo diesel making 277 horsepower and 460 lb.-ft of torque. The Sierra also offers a powerful 6.2L Ecotec3 V8 delivering up to 420-horsepower and 460 lb.-ft of torque, also capable of offering a payload capacity of 9400 lbs.

All 1500 and Sierras come with the option of 4-wheel drive except Denali where All-wheel drive is standard. Maximum tow ratings top out at 12,200 pounds when properly equipped.

Trim levels for the 1500 come in five different flavors. Sierra, SLE, SLT, Elevation and Denali.
In standard Sierra trim, the Sierra is fairly basic with automatic windows and door locks, air conditioning, Bluetooth, Apple CarPlay/Android Auto, two USB ports and Teen Driver Safety suite as standard equipment.

SLE versions add OnStar, heated exterior mirrors, heated front seats, leather-wrapped heated steering wheel with audio controls, 8-inch touchscreen audio system with six speakers, dual-zone climate control, SiriusXM radio capability, cruise control, two 12V power sockets, four USB ports, remote keyless entry with remote engine start and a EZ Lift/Lower tailgate.

The SLT trim includes leather upholstery seating, steering wheel mounted audio controls, power adjustable pedals and power-folding mirrors with tilt down function and GMC's MultiPro Tailgate.

Denali versions come in only one trim level and in crew cab and short-bed. Regardless of bed-length, the Sierra Denali includes an 8-inch color touch screen, 7-speaker, wireless phone charger, six USB ports, ventilated driver/front passenger seats, a rear-camera mirror, a surround view camera system. The Denali also comes with a unique grill and other selected trim. Standard safety features on the Denali include blind spot warning, rear collision warning front/rear parking sensors,

GMC's AT4 off-road model includes a 2-inch lift, off-road Rancho shock-absorbers, Goodyear Wrangler Territory tires, high-clearance step, a standard V8 with four-wheel drive and special tires for back roads.

Available safety equipment includes front pedestrian braking, forward-collision alert, rear cross-traffic alert, lane-keep assist with lane-departure warning, automatic braking, and lane-change alert with blind-zone alert. However, more common items such as a rear seat entertainment system, a navigation system, wireless mobile device charging, a remote locking tailgate and a sunroof are also available on the Sierra.
Model Strengths
Many Configuration Possibilities
High Towing Capacity
Pro Grade Trailering System
Standard Luxury Options
Model Changes
For 2021, the GMC Sierra 1500 returns with many updates and changes, including new standard features, new exterior colors, new wheel options, enhanced trailer-assistance features and other package-related changes.
Model Value
The GMC Sierra derives a lot of value from being extremely customizable. Even in its most basic form, the Sierra feels upscale, but still extremely capable. The Sierra is affordable enough that owners will feel comfortable using the truck in the utilitarian way it was intended. Furthermore, updates to the MultiPro tailgate and Prograde Trailering system are a real game-changer in this competitive truck market. Denali editions offer plenty of luxury for those who want a truck that both works hard and coddles its occupants. The Sierra competes with many other pickup trucks in its class, such as the Ram 1500, Ford F-150 and its close sibling; the Chevrolet Silverado.
Features
Preferred Equipment Group 4SB: HD Rear Vision Camera; LED Cargo Area Lighting; Remote Vehicle Starter System; 2 USB Ports (1st Row); Hill Descent Control; Electric Rear-Window Defogger; Floor-Mounted Center Console; Theft Deterrent System (unauthorized Entry); Body-Color Surround Grille; 170 Amp Alternator; Auxiliary External Transmission Oil Cooler; Heavy-Duty Air Filter; Skid Plates; Compass; 4.2" Diagonal Color Display Driver Info Center; Electrical Lock Control Steering Column; Trailering Package; 120-Volt Instrument Panel Power Outlet; Heated Driver and Front Outboard Passenger Seating; Off-Road Suspension; Front Premium Floor Liners with Removable Carpet Insert; Steering Wheel Audio Controls; GMC Connected Access Capable; Color-Keyed Carpeting Floor Covering; OnStar and GMC Connected Services Capable; Power Front Passenger Windows with Express Up/down; 2-Speed Transfer Case; Deep-Tinted Glass; Spray-On Pickup Bed Liner with AT4 Logo; Premium GMC Infotainment System Radio with Multi-Touch; Power Rear Windows with Express Down; Red Recovery Hooks; Integrated Trailer Brake Controller; Power Front Windows with Driver Express Up/down; Ventilated Driver and Front Passenger Seats; 18" X 8.5" Machined Aluminum Wheels; Manual Tilt-Wheel and Telescoping Steering Column; Rear Dual USB Charging-Only Ports; Keyless Open and Start; 4G LTE Wi-Fi Hotspot Capable; ProGrade Trailering System; Rear Wheelhouse Liners; 12-Volt Rear Auxiliary Power Outlet; 2 USB Ports; Auto-Locking Rear Differential; Power Door Locks
Satin Steel Metallic
LT275/65R18C MT BW Tires
Apple CarPlay/Android Auto smart device mirroring
4G LTE Wi-Fi Hotspot capable mobile hotspot internet access
HD Rear Vision Camera w/Hitch View rear mounted camera
Brake assist system
Cruise control with steering wheel mounted controls
Ventilated driver and front passenger seats
Keyfob remote start
Heated steering wheel
Heated driver and front passenger seats
Heated rear seats
Leather front seat upholstery
Primary monitor touchscreen
Driver seat power reclining
lumbar support
cushion tilt
fore/aft control and height adjustable control
AutoTrac part and full-time 4WD
EcoTec3 5.3L V-8 gasoline direct injection
variable valve control
regular unleaded
engine with cylinder deactivation and 355HP
EcoTec3 5.3L V-8
Teen Driver restricted driving mode/alerts
Smart key with hands-free access and push button start
Keyfob window control
Push-button
Bluetooth wireless audio streaming
Hitch Guidance vehicle to trailer hitching assist
GMC ProGrade Trailering System trailer light test
GMC ProGrade Trailering System trailer light malfunction warning
GMC ProGrade Trailering System trailer theft alarm
Dual-zone front climate control
Immobilizer
Bluetooth handsfree wireless device connectivity
Trailer brake controller
Trailer Sway Control (TSC) trailer sway control
Trailering Assist Guidelines vehicle and trailer reverse assist with visual graphic guidance only
Premium GMC Infotainment System external memory control
Internet radio capability
6 USB ports
StabiliTrak w/Proactive Roll Avoidance electronic stability control system with anti-roll
Hill Descent Control (HDC)
Hill Start Assist (HSA)
Automatic climate control
Rear seat check warning
1 exterior 120V AC power outlet
LED daytime running lights
LED brake lights
LED front fog lights
Leather and metal-look steering wheel
EZ Lift
EZ Lower
Integrated tailgate step
Trailer hitch light
Manual rear child safety door locks
Heated driver and passenger side door mirrors
Package
Trailering Package includes trailer hitch, 7-pin and 4-pin connectors and (CTT) Hitch Guidance
ProGrade Trailering System includes (PZ8) Hitch Guidance with Hitch View and (U1D) In-vehicle Trailering App
Mechanical
Engine, 5.3L EcoTec3 V8 (355 hp [265 kW] @ 5600 rpm, 383 lb-ft of torque [518 Nm] @ 4100 rpm); featuring available Dynamic Fuel Management that enables the engine to operate in 17 different patterns between 2 and 8 cylinders, depending on demand, to optimize power delivery and efficiency (Not available on TK10743 model.)
Rear axle, 3.23 ratio
Pickup bed
GVWR, 7000 lbs. (3175 kg) (Requires Crew Cab model with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine.)
Air filter, heavy-duty
Automatic Stop/Start (Standard on vehicles built before 6-7-2021. Most vehicles built on or after 6-7-2021 that are equipped with a V8 engine and (MQB) 10-speed automatic transmission will have (NSS) Not Equipped with Automatic Stop/Start, which removes Automatic Stop/Start and its content. See dealer for details)
Hill Descent Control
Auto-locking rear differential
Transfer case, two-speed, electronic Autotrac with push button control (4WD models only)
Suspension, Off-Road with 2" factory installed lift and monotube shocks
Four wheel drive
Cooling, external engine oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Cooling, auxiliary external transmission oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Alternator, 170 amps (Included and only available with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine. Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Battery, heavy-duty 730 cold-cranking amps/80 Amp-hr, maintenance-free with rundown protection and retained accessory power (Included and only available with (L84) 5.3L EcoTec3 V8 engine, (L3B) 2.7L Turbo engine and (L87) 6.2L EcoTec3 V8 engine.)
Frame, fully-boxed, hydroformed front section
Trailer brake controller, integrated
Recovery hooks, Red
Skid Plates
Cargo tie downs (12), fixed, rated at 500 lbs per corner
Steering, Electric Power Steering (EPS) assist, rack-and-pinion
Brakes, 4-wheel antilock, 4-wheel disc with DURALIFE rotors
Capless Fuel Fill
Exhaust, dual with premium tips (With (PCP) AT4 CarbonPro Edition the exhaust tips will be black.)
Exhaust, aluminized stainless-steel muffler and tailpipe
Exterior
Wheel, 17" x 8" (43.2 cm x 20.3 cm) full-size, steel spare
Wheelhouse liners, rear
Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
Bumper, front, body-color lower (Front bumper color will be high gloss black.)
Bumper, rear body-color with corner steps
CornerStep, rear bumper
Grille (Body-color surround with high gloss Black mesh and Black chrome inserts. With (PCP) AT4 CarbonPro Edition the grille will have a unique grille surround with Black Chrome finish.)
Fog lamps, LED
Taillamps, LED signature taillight with LED stop and reverse light
Mirror caps, high gloss Black (Deleted with (DQS) outside power adjustable vertical trailering mirrors and mirror caps will be chrome.)
Glass, deep-tinted
Lamps, cargo area, cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel
LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob
Tailgate, GMC MultiPro Tailgate with six functional load/access features
Tailgate, gate function manual with EZ Lift includes power lock and release, includes hitch area light
Tailgate and bed rail protection caps, top
Door handles, body-color
Entertainment
Audio system feature, 6-speaker system
Steering wheel audio controls
4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)
Interior
Seat adjuster, driver 10-way power including lumbar
Seat adjuster, passenger 10-way power including lumbar
Seat, Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, center fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
Center Console, floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
Floor covering, color-keyed carpeting
Steering column, manual Tilt-Wheel and telescoping
Steering wheel, leather-wrapped
Steering wheel, heated
Instrument cluster, 6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
Driver Information Center, 4.2" diagonal color display includes driver personalization
In-vehicle Trailering App, System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder and trailer electrical diagnostics
Compass, located in instrument cluster
Exterior Temperature Display, located in radio display
Brake lining wear indicator
Remote vehicle starter system
Theft-deterrent system, unauthorized entry
Steering column, lock control, electrical
Power outlet, instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
USB ports, dual, charge-only (2nd row)
Power outlet, bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
Air conditioning, dual-zone automatic climate control
Air vents, rear
Assist handles front A-pillar mounted for driver and passenger, rear B-pillar mounted
GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details.)
Safety
StabiliTrak, stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
Airbags, Dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag (Always use seat belts and child restraints. Children are safer when properly secured in a rear seat in the appropriate child restraint. See the Owner's Manual for more information.)
Hitch Guidance
Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob, to help encourage safe driving behavior. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver
Rear Seat Reminder
Similar Vehicles

2024 GMC Sierra AT4

Stock: 241792W

Quick View

2021 GMC Sierra AT4

Stock: 222316B

Quick View

2024 GMC Sierra SLT

Stock: 582014C

Quick View

2020 GMC Sierra SLT

Stock: A08001B

Quick View

Although every reasonable effort has been made to ensure the accuracy of the information contained on this site, absolute accuracy cannot be guaranteed. This site, and all information and materials appearing on it, are presented to the user "as is" without warranty of any kind, either express or implied. All vehicles are subject to prior sale. Price does not include applicable tax, title, and license charges. ‡Vehicles shown at different locations are not currently in our inventory (Not in Stock) but can be made available to you at our location within a reasonable date from the time of your request, not to exceed one week.

© 2026 Red River Ford Cabot