SLT trim, Onyx Black exterior and Jet Black interior. EPA estimate 20 MPG Hwy/16 MPG City! CARFAX 1-Owner. AND MORE!
BUY WITH CONFIDENCE
Passed our 128-point vehicle inspection for safety and reliability. Vehicles that have fewer than 75,000 miles and are less than 10 years old qualify for our, We strive to make sure our vehicles are like none other, at no expense to you! This includes our 3 Month 3,000 Mile warranty and our 1 year cutting edge Repel paint protection. Big Country Protection Program completely complimentary.
KEY FEATURES INCLUDE
4x4, Back-Up Camera, Onboard Communications System, Trailer Hitch, Chrome Wheels, Remote Engine Start, Dual Zone A/C, WiFi Hotspot. Keyless Entry, Privacy Glass, Steering Wheel Controls, Heated Mirrors, Alarm.
OPTION PACKAGES
TEXAS EDITION SLT PREMIUM PACKAGE includes (PCY) SLT Convenience Package, (NZM) 20 Polished aluminum wheels, (BVT) Chrome assist steps and Texas Edition badging. SUNROOF, POWER, DRIVER ALERT PACKAGE I includes (UD5) Front and Rear Park Assist, (UKC) Lane Change Alert with Side Blind Zone Alert and (UFG) Rear Cross Traffic Alert (Includes Perimeter Lighting. Includes (V76) recovery hooks on 2WD models. X31 OFF-ROAD PACKAGE includes Off-Road suspension, (JHD) Hill Descent Control, (NZZ) skid plates, (K47) heavy-duty air filter and X31 hard badge Includes (NQH) 2-speed transfer case, (XCK) 265/65R18SL all-terrain, blackwall tires and (N10) dual exhaust. LPO, ALL-WEATHER FLOOR LINER, 1ST AND 2ND ROWS (dealer-installed), AUDIO SYSTEM, PREMIUM GMC INFOTAINMENT SYSTEM WITH 8 DIAGONAL COLOR TOUCH-SCREEN, INCLUDES MULTI-TOUCH DISPLAY, AM/FM STEREO Bluetooth® streaming audio for music and most phones; featuring wireless Android Auto® and Apple CarPlay® capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings (Note: (PZ8) Hitch Guidance with hitch view is included with trim. Includes SiriusXM with 360L.) (STD), 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 (STD), TRANSMISSION, 8-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking (STD), SLT CONVENIENCE PACKAGE includes (A50) bucket seats with (D07) center console, (KQV) ventilated front seats, (A48) rear sliding power window, (UG1) Universal Home Remote, (MCZ) 2 USB ports with auxiliary input (IP Mounted), (MCR) 2 USB Ports/SD Card/Aux Jack (Inside Console with bucket seats) and (KA6) rear heated seats (KA6) Heated Second Row Outboard Seats are included on Crew Cab models built before 7-26-2021. Certain vehicles built on or after 7-26-2021 will include (RFU) Not Equipped with Heated Second Row Outboard Seats, which removes (KA6) Heated Second Row Outboard Seats. See dealer for details.). GMC SLT with Onyx Black exterior and Jet Black interior features a 8 Cylinder Engine with 355 HP at 5600 RPM*.
VEHICLE REVIEWS
Great Gas Mileage: EPA estimate 20 MPG Hwy.
A GREAT TIME TO BUY
Reduced from $37,317. This Sierra 1500 is priced $6,900 below J.D. Power Retail.
VISIT US TODAY
At Big Country Auto of Madison County it is our mission to courteously, energetically, and diligently work to provide you, our customer, the best and most reliable transportation. At Big Country Auto of Madison County it is our challenge to serve you and our communities better than anyone in the industry. YOU, the customer, are our past present and future. NEVER be afraid to ask how we can serve you better today. This is our PROMISE to you.
Pricing analysis performed on 10/21/2026. Horsepower calculations based on trim engine configuration. Fuel economy calculations based on original manufacturer data for trim engine configuration. Please confirm the accuracy of the included equipment by calling us prior to purchase.
Used 2021 GMCSierra 1500 SLT
- Exterior Color
- Onyx Black
- Interior Color
- Jet Black
- Odometer
- 107,549 miles
- Body/Seating
- Truck Crew Cab/5 seats
- Seats
- 5 seats
- Fuel Economy
- 14/20 MPG City/Hwy
- Transmission
- Automatic
- Drivetrain
- 4x4
- Engine
- V-8 cyl
- VIN
- 3GTU9DED9MG223259
- Stock Number
- A3839
GMC
Sierra 1500
Highlighted Features
- Leather upholstery
- Automatic temperature control
- Wireless phone connectivity
- Front dual zone A/C
- Auto-dimming rearview mirror
- Split folding rear seat
- Memory seat
- Heated front seats
- Ventilated front seats
- Perimeter/approach lights
- Remote keyless entry
- Heated steering wheel
Included Packages & Accessories
- Transmission: 8-Speed Automatic
- All-Weather Floor Liner
- Radio: Premium GMC Infotainment Sys w/Multi-Touch
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- Engine: 5.3L EcoTec3 V8 w/NSS
- Transmission: 10-Speed Automatic
- SLT Convenience Package
- Front Bucket Seats
- Floor-Mounted Center Console
- Ventilated Driver & Front Passenger Seats
- Power Sliding Rear Window w/Rear Defogger
- Universal Home Remote
- Heated 2nd Row Outboard Seats
- 2 USB Ports
- Texas Edition SLT Premium Package
- Wheels: 20" x 9" Polished Aluminum
- Chrome Wheel To Wheel Assist Steps
- Texas Edition Badging
Included Packages & Options
- Texas Edition SLT Premium Package$3,045
- SLT Convenience Package
- Wheels: 20" x 9" Polished Aluminum
- Chrome Wheel To Wheel Assist Steps
- Texas Edition Badging
- SLT Convenience Package$1,445
- Front Bucket Seats
- Floor-Mounted Center Console
- Ventilated Driver & Front Passenger Seats
- Power Sliding Rear Window w/Rear Defogger
- Universal Home Remote
- Heated 2nd Row Outboard Seats
- 2 USB Ports
Included Options
- All-Weather Floor Liner$210
Detailed Specifications
- 1-touch down
- 1-touch up
- Air conditioning
- Auto-dimming rearview mirror
- Automatic temperature control
- Driver door bin
- Driver vanity mirror
- Front beverage holders
- Front dual zone A/C
- Garage door transmitter
- Heated steering wheel
- Illuminated entry
- Memory seat
- Overhead console
- Passenger door bin
- Passenger vanity mirror
- Power windows
- Proximity key: doors and push button start
- Rear beverage holders
- Rear door bins
- Remote engine start: keyfob
- Remote keyless entry
- Speed control
- Telescoping steering wheel
- Tilt steering wheel
- Alloy wheels
- Front anti-roll bar
- Front wheel independent suspension
- Power steering
- Speed-sensing steering
- Wheel size: 20"
- 1st row LCD monitors: 2
- Primary LCD size: 8.0"
- Radio data system
- Smart device integration: Android Auto/Apple CarPlay
- Steering wheel mounted audio controls
- Wireless phone connectivity: Bluetooth
- Front center armrest
- Front seats: bucket
- Heated front seats
- Heated rear seats
- Leather upholstery
- Max seating capacity: 5
- Power 2-way driver lumbar support
- Power 2-way passenger lumbar support
- Power driver seat
- Power passenger seat
- Rear seat center armrest
- Rear seats: split-bench
- Rear seats Folding position: fold-up cushion
- Seat Upholstery: leather
- Split folding rear seat
- Ventilated front seats
- Cylinder deactivation
- Drive type: four-wheel
- Engine location: front
- Fuel economy city: 14mpg
- Fuel economy combined: 16mpg
- Fuel economy highway: 20mpg
- Fuel tank capacity: 24.0gal.
- Hybrid traction battery type: none
- Manual-shift auto
- Mode select transmission
- Rear locking differential
- Standard fuel economy fuel type: gasoline
- Transmission: 10 speed automatic
- Variable valve control
- Ground clearance (min): 205mm (8.1")
- Auto-dimming door mirrors
- Bumpers: chrome
- Door mirrors: chrome
- Heated door mirrors
- Left rear passenger door: conventional
- Power door mirrors
- Rear cargo: tailgate
- Rear step bumper
- Right rear passenger: conventional
- Trailer hitch receiver
- Trailer sway control
- Exterior body width: 2,063mm (81.2")
- Exterior height: 1,918mm (75.5")
- Exterior length: 5,885mm (231.7")
- Front headroom: 1,093mm (43.0")
- Front hiproom: 1,554mm (61.2")
- Front legroom: 1,131mm (44.5")
- Front shoulder room: 1,677mm (66.0")
- Rear headroom: 1,019mm (40.1")
- Rear hiproom: 1,530mm (60.2")
- Rear legroom: 1,102mm (43.4")
- Rear shoulder room: 1,655mm (65.2")
- Wheelbase: 3,744mm (147.4")
- Appearance: analog
- Compass
- Delay-off headlights
- Front fog lights
- Front reading lights
- Fully automatic headlights
- Low tire pressure warning
- Oil pressure gauge
- Outside temperature display
- Rear reading lights
- Rear window defroster
- Tachometer
- Trip computer
- Variably intermittent wipers
- Voltmeter
- 4 wheel disc brakes
- ABS brakes
- Brake assist
- Dual front impact airbags
- Dual front side impact airbags
- Electronic stability
- Ignition disable
- Occupant sensing airbag
- Overhead airbag
- Panic alarm
- Perimeter/approach lights
- Security system
- Traction control
Standard Features
- SLT Convenience Package
- Wheels: 20" x 9" Polished Aluminum
- Chrome Wheel To Wheel Assist Steps
- Texas Edition Badging
- Front Bucket Seats
- Floor-Mounted Center Console
- Ventilated Driver & Front Passenger Seats
- Power Sliding Rear Window w/Rear Defogger
- Universal Home Remote
- Heated 2nd Row Outboard Seats
- 2 USB Ports
- 6-Speaker Audio System Feature
- SiriusXM w/360L
- Transmission: 10-Speed Automatic
Dealer Notes
KBB.com Consumer Reviews

Overall4.0Out of 5
- 4.0
Depreciation of 50%
By Manny A | on 10/28/2026 10:06:36 AM
This is a amazing truck.. Comfortable lots of sensors Etc…. My truck has 30000 miles I when to trade in they offer $46000 I paid $86000 the depreciation is incredible I don’t buy new truck never again.… - 5.0
2021 GMC SLT 4WD SIERRA, Great Truck
By Ransom1 | on 10/15/2026 4:18:42 PM
This is my 8th truck. This is hands down the very best truck I’ve ever owned. Not only is it the best looking truck on the road I have never had it in the shop except for oil changes and scheduled maintenance. The silver does not show dirt or grime.… - 5.0
Great 4 cylinder truck
By Steve | on 9/23/2026 2:01:15 AM
I have only pulled a trailer one time and still got 18 mpg down doing 80 down the interstate. Otherwise this vehicle is used for commuting or recreating. I typically get 22-24 mpg driving MT highways to the mountains. The turbo has some spunk for getting up to speed and the five years I've had my truck no complaints.…
All reviews on KBB.com
Based on 71 consumer ratings for 2019–2026 models. | Privacy
- We're here to help: (531) 230-1001





