Used 2021 GMC Sierra 1500 AT4 for Sale GLENDIVE, MT - $42,600
Dealer-Supplied Listing. Pricing, availability, and specifications on this page come directly from HKT BIG SKY MOTORS and are synced automatically by CARVID. Confirm final pricing and availability with the dealer before purchase. Last synced on July 18, 2026.
11 Photos of this 2021 GMC Sierra 1500
This 2021 GMC Sierra 1500 AT4 is a used pickup truck with 51,103 mi. It is equipped with 3.0L, Automatic transmission, 4WD and runs on Diesel Fuel. The vehicle has a Red exterior. This specific vehicle (VIN: 3GTU9EET9MG448505) is currently available for sale in GLENDIVE, Montana (ZIP 59330), Dawson County and is offered by HKT BIG SKY MOTORS.
Market Information
This 2021 GMC Sierra 1500 achieves an EPA-estimated 22 city / 26 highway MPG. This vehicle has been listed for 226 days. The price has been reduced by $900 from the original listing price of $43,500. Odometer reads 51,103 mi. Listed at $42,600 in GLENDIVE, Montana.
Seller Information
Offered for sale by HKT BIG SKY MOTORS, an auto dealer located at 2515 W TOWNE ST, GLENDIVE, Montana.
Contact: (406) 377-3350
Located in GLENDIVE, MT (ZIP 59330), in Dawson County.
Hours
● Open nowWhy Buy From HKT BIG SKY MOTORS?
- ✓ Transparent pricing with no hidden fees
- ✓ Detailed video walkthroughs of every vehicle
- ✓ Located in GLENDIVE, Montana for easy viewing
- ✓ Professional inspection and vehicle history available
- ✓ Direct contact at (406) 377-3350
Vehicle Details
$42,600 • 51,103 mi • GLENDIVE, MT • 📞 (406) 377-3350
Specifications
Vehicle Features
Mechanical
- • 3.0L
- • 220 Amp Alternator
- • Engine Block Heater
- • Automatic
- • 4WD
- • Diesel Fuel
- • 22/26 MPG (City/Hwy)
Exterior
- • Red Paint
- • 4-Door Configuration
Interior
- • Standard Interior
📋 Full Vehicle Details (Click to expand)
Overview:
This is a 2021 GMC Sierra 1500 AT4 with 51,103 mi, located in GLENDIVE, Montana at HKT BIG SKY MOTORS.
Complete Specifications:
- • VIN: 3GTU9EET9MG448505
- • Year: 2021
- • Make: GMC
- • Model: Sierra 1500
- • Trim: AT4
- • Mileage: 51,103 mi
- • Exterior Color: Red
- • Engine: 3.0L
- • Transmission: Automatic
- • Drivetrain: 4WD
- • Fuel Type: Diesel Fuel
- • Fuel Economy: 22 city / 26 highway MPG
- • Doors: 4
- • Price: $42,600
- • Location: GLENDIVE, Montana (ZIP 59330)
- • Dealer: HKT BIG SKY MOTORS
Availability:
This vehicle is currently in stock and available for immediate purchase. Contact us at (406) 377-3350 to schedule a test drive or viewing.
Description
This Cayenne Red Tintcoat 2021 GMC Sierra 1500 AT4 Diesel 4x4 is a bold, highly capable truck that blends rugged off-road performance with premium comfort, making it an outstanding choice for drivers who demand strength, technology, and refinement in one package. The Duramax diesel engine delivers impressive torque and efficiency, giving you confident power for towing, hauling, and long highway drives. Paired with the AT4 4x4 system and off-road suspension, this Sierra is built to handle rough terrain, back roads, and challenging weather conditions across Eastern Montana and North Dakota. Inside, the Jet Black leather interior with Kalahari accents creates a distinctive, upscale cabin that’s both comfortable and functional. Heated and cooled front seats keep you comfortable in every season, while navigation and intuitive technology make every drive easier and more connected. Remote start adds everyday convenience, allowing you to warm up or cool down the truck before you even climb in. Equipped with the trailering package, this Sierra is ready to work as hard as you do, offering added confidence and control when towing boats, campers, or equipment. Combined with the off-road package, this truck delivers versatility that performs just as well on the jobsite as it does on weekend adventures. The Cayenne Red Tintcoat exterior and aggressive AT4 styling give it a commanding presence that stands out wherever it goes. At HKT Big Sky Motors, you’ll enjoy a small-town, no-hassle buying experience that puts your needs first. We’ve been locally owned since 1956 and proudly serve customers throughout Eastern Montana and North Dakota. Stop by and see us at 2515 W Towne Street in Glendive, MT, give us a call at (406) 377-3350, or reach out by text at (406) 939-4301 to learn more about this 2021 GMC Sierra 1500 AT4 Diesel 4x4 and schedule your test drive today.
Frequently Asked Questions
What is the price of this 2021 GMC Sierra 1500?
This 2021 GMC Sierra 1500 is priced at $42,600. Mileage is 51,103 mi.
How long has this GMC Sierra 1500 been for sale?
This vehicle has been listed for 226 days. The asking price has been reduced by $900 since it was first listed at $43,500.
Where is this GMC Sierra 1500 located?
This vehicle is located at HKT BIG SKY MOTORS, 2515 W TOWNE ST in GLENDIVE, Montana (ZIP 59330), Dawson County. Call (406) 377-3350 to schedule an appointment.
Is this 2021 GMC Sierra 1500 still available?
Yes, as of our last inventory sync on July 18, 2026, this 2021 GMC Sierra 1500 (VIN: 3GTU9EET9MG448505) is in stock and available for immediate purchase.
What are the key features of this GMC Sierra 1500?
This 2021 GMC Sierra 1500 features Automatic transmission, 4WD drivetrain, a 3.0L, Red exterior paint. It achieves 22 city / 26 highway MPG.
💰 Payment Calculator (Click to expand)
This estimate does not include a documentation fee. Most dealers charge one, and amounts vary widely by dealer and by state. It also excludes title, registration, tag, and other charges. Sales tax is an estimated average rate for Montana and your actual rate depends on where the vehicle is registered. Confirm all fees, the final out-the-door price, and financing terms directly with HKT BIG SKY MOTORS.
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