2021 GMC Sierra 3500 HD AT4
$48 less than this car
- 98,808 mi
- 4WD
- Automatic
- Diesel
- Truck
Suntrup Buick GMC · St Peters, MO · 23 mi away
0 miles · truck

Why BUY from Dave Sinclair Buick GMC? When you choose this Summit White 2021 GMC Sierra 3500HD AT4 with miles, you are not just buying a used vehicle - you are investing in quality, reliability and peace of mind. Our clientele depend on us for Transparent Pricing, Convenience and, most importantly, Customer FIRST Service! No Accidents! What this vehicle includes: Driver Alert Package IPerimeter LightingUltrasonic Front and Rear Park AssistRear Cross Traffic AlertLane Change Alert with Side Blind Zone AlertDriver Alert Package IISafety Alert SeatIntelliBeam Automatic High Beam On/offFollowing Distance IndicatorForward Collision AlertLane Departure WarningAutomatic Emergency BrakingAT4 Premium Plus PackagePower Sunroof20" Machined Aluminum WheelsAT4 High Clearance StepTechnology PackageAuto-Dimming Inside Rearview Mirror with Camera8" Driver Information CenterMulticolor 15" Diagonal Head-Up DisplayPreferred Equipment Group 4SBGMC Connected Access CapablePower Front Passenger Windows with Express Up/downPower Rear Windows with Express DownDeep-Tinted GlassKeyless Open and StartPower Door LocksPower Front Windows with Driver Express Up/downRear Wheelhouse LinersPremium Rear Floor Liners with Removable Carpet InsertPremium Front Floor Liners with Removable Carpet InsertRemote Vehicle Starter SystemElectric Rear-Window DefoggerSpray-On Pickup Bed Liner with AT4 LogoCompass Located in Instrument ClusterFloor-Mounted Center ConsolePainted Black Surround Grille with High Gloss Black MeshIntegrated Trailer Brake ControllerHeated Driver and Front Outboard Passenger Seats2nd Row Heated Outboard Seats120-Volt Bed Mounted Power Outlet120-Volt Instrument Panel Power Outlet12-Volt Rear Auxiliary Power OutletVentilated Driver and Front Passenger Seats2 USB Ports Inside Console2 USB Ports (first Row)Electrical Lock Control Steering ColumnManual Tilt-Wheel/telescoping Steering Column2-Speed Active Transfer CaseProGrade Trailering System4.2" Diagonal Color Display Driver Info CenterOnStar and GMC Connected Services CapableLED Cargo Area LightingRed Recovery HooksSteering Wheel Audio Controls2nd Row Dual USB Charge-Only PortsUnauthorized Entry Theft-Deterrent SystemHD Rear Vision Camera4G LTE Wi-Fi Hotspot CapableWireless Phone ProjectionX31 Off-Road PackageGooseneck/5th Wheel PackageGooseneck/5th Wheel Prep PackageAT4 Preferred Package Safety and Security The vehicle is equipped with a system that senses, and then prepares, the vehicle and/or occupants, for an impending forward collision. The vehicle is equipped with a camera that displays an image of the area behind the vehicle on an interior display.Technology and Telematics Without the need for a manufacturer specific app to be installed on the smart device, the vehicle infotainment system can access and control functions of a smart device physically plugged-into the vehicle. Apple CarPlay/Android Auto smart device wireless mirroring Mobile devices can wirelessly connect to the internet through the vehicle's private mobile network. EMISSIONS, FEDERAL REQUIREMENTS, ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE, TRANSMISSION, ALLISON 10-SPEED AUTOMATIC, GVWR, 12,100 LBS. (5488 KG) WITH SINGLE REAR WHEELS, REAR AXLE, 3.42 RATIO, WHEELS, 20" (50.8 CM) MACHINED ALUMINUM, TIRES, LT275/65R20 ALL-TERRAIN, BLACKWALL, SUMMIT WHITE, SEATS, FRONT BUCKET WITH CENTER CONSOLE, JET BLACK WITH KALAHARI ACCENTS, PERFORATED FRONT LEATHER SEATING SURFACES, AUDIO SYSTEM, PREMIUM GMC INFOTAINMENT SYSTEM WITH NAVIGATION AND 8" DIAGONAL COLOR TOUCH-SCREEN, AT4 PREMIUM PLUS PACKAGE, AT4 PREFERRED PACKAGE, TECHNOLOGY PACKAGE, GOOSENECK / 5TH WHEEL PACKAGE, DRIVER ALERT PACKAGE I, DRIVER ALERT PACKAGE II, LPO, HITCH PACKAGE, ENGINE BLOCK HEATER, ALTERNATOR, 220 AMPS, GOOSENECK / 5TH WHEEL PREP PACKAGE, HEAVY DUTY FRONT SPRING/CAMPER PACKAGE, EXHAUST BRAKE, SUNROOF, POWER, LPO, AT4 HIGH CLEARANCE STEP, WINTER GRILLE COVER, INTELLIBEAM, AUTOMATIC HIGH BEAM ON/OFF, LAMPS, SMOKED AMBER LED ROOF MARKER, (LED),
Dealer-provided information may change. Confirm availability, price, vehicle condition, taxes and fees with the selling dealership.
Among the lowest-priced · 80% of 5 similar listings ask more than this car.
How we calculate market value: comparable cars for sale now plus their last listed prices.
Price tracked by AutosXchange since Nov 6, 2026. No price change at this dealership since Nov 6 ($47,949).
AutosXchange Intel Hub: Price changes for this model in Missouri · This model in the Intel Hub · Market movers in Missouri
Dealer-advertised asking prices as observed by AutosXchange (data as of Nov 12); earlier listings at other dealerships are shown by state only. Source: AutosXchange Intel Hub, autos-xchange.com/market.
Same 2020–2021 Sierra 3500 AT4 · used · within 250 miles of St Louis, Missouri. All 5 comparable cars for sale, nearest first.
$48 less than this car
Suntrup Buick GMC · St Peters, MO · 23 mi away
$5,440 more than this car
Diepholz Chevrolet Buick GMC · Charleston, IL · 134 mi away
$4,015 more than this car
Universal Auto Plaza · Blue Springs, MO · 216 mi away
$5,445 more than this car
Flaherty Chevrolet · Brandenburg, KY · 229 mi away
$1,449 more than this car
Bolivar Ford · Bolivar, TN · 240 mi away
2021 GMC Sierra 3500 HD AT498,808 miles · Suntrup Buick GMC · St Peters, MO · 23 mi away$47,901$48 less than this car
2021 GMC Sierra 3500 HD AT470,462 miles · Diepholz Chevrolet Buick GMC · Charleston, IL · 134 mi away$53,389$5,440 more than this car
2021 GMC Sierra 3500HD AT469,508 miles · Universal Auto Plaza · Blue Springs, MO · 216 mi away$51,964$4,015 more than this car
2021 GMC Sierra 3500 HD AT489,501 miles · Flaherty Chevrolet · Brandenburg, KY · 229 mi away$53,394$5,445 more than this car
2020 GMC Sierra 3500HD AT4 Truck Duramax V8 Turbodiesel95,370 miles · Bolivar Ford · Bolivar, TN · 240 mi away$49,398$1,449 more than this carAll years and trims. Nearest first.
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
Dave Sinclair Buick GMC · St Louis, MO · 0 mi away
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