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*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
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Used
2021 GMC Sierra 3500 AT4 trucks
for sale
near me
- Down Payment
- $0
- Net trade-in value
- $0
- Months
- 72
- APR
- 7.0%
- Sales tax
- 0.0%
*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
**Your Saved Vehicles list will be shared along with your contact information when you submit a vehicle request to a dealership. To opt out of this sharing, please view your options on Cars.com Privacy Notice.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Thanks for the no hassle experience and help with getting
Thanks for the no hassle experience and help with getting what I needed in the price range I wanted. Good job with sales person who helped us. Thanks Tim McLure
Truck is a Solid vehicle overall.
Has a really Big feel to it. I currently use mine to pull gooseneck trailer. I haven't had a load yet that I couldn't pull. The downsides to this truck is to me I feel it could get better fuel mileage. Also I had trouble with #4 injector...dealership replaced it. Now my AC doesn't work all the time. Although it sounds like it's blowing it isn't.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
DeJon Was an awesome salesman I highly recommend blasius
DeJon Was an awesome salesman I highly recommend blasius as it is always a pleasant experience I have purchased my last 3 vehicles with them and have family that has bought vehicles from them. I love how friendly and personable DeJon was and made the experience very smooth. The finance manager Veronica is awesome. Thank you for my Tesla model Y
Love it.
I love the new features this truck offers. I would highly recommend this truck if your looking for a Diesel. I provides all the features and benefits you would want.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Just bought my car here.
Just bought my car here. Had an awesome buying experience! Everything was super fast and easy I will buying my next car here!!
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Cameron Pearson and the people of West Metro were great
Cameron Pearson and the people of West Metro were great to work with they made the whole process smooth and enjoyable. We will definitely reach out to West Metro for our next purchase.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Will greeted me and worked with me to buy a car.
Will greeted me and worked with me to buy a car. He was efficient, no pressure, and professional. I would definitely buy a car from him again.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Sales associate Erik was insightful and had good follow
Sales associate Erik was insightful and had good follow through. There was an hour wait for dianci g but they worked with my situation and the deal got done!
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Andrew Palmer is the salesman you want to talk to about
Andrew Palmer is the salesman you want to talk to about your next purchase of a vehicle I got mine through him and he was the most helpful salesman I have ever had for anything vehicle or not this man is awesome!! He even came in on his day off multiple times just for me to make sure I got a rig and was on the road in a very short time even though he had family plans! I highly and very highly recommend Andrew Palmer for your next purchase of a vehicle you will not be disappointed with this salesman he’s the man! And thank you Andrew Palmer for going above and beyond what I expected out of a salesman thank you sir! What an awesome guy and awesome dealership I will be back when I need another one no question about that! 10 out of 5 star experience with Andrew Palmer thank you again so very much Mr Palmer
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Outstanding
I would like to sincerely thank millersburg Buick on the sale of a new truck. Outstanding!! Service, selection, customer service. Friendly, knowledgeable . I defiantly will be a repeat buyer. Thanks again!!
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
We were delighted to be able to work once again with Juan
We were delighted to be able to work once again with Juan Ibarra for the purchase of our 2025 Tahoe Premier. We first met Juan in 2014 when we bought a new Silverado from him/ Blade after a not so nice experience with another dealership. Juan is personable, straight talking and respectful of his clients. No wonder he has been at the same dealership for 23 years. Thanks again Juan. And Kudos to Kevin Sampson for all the training with the tech in the Tahoe.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
GREAT.
GREAT. FRIENDLY & PROFFESIONAL. I HIGHLY RECOMEND. WE HAVE OWNED GM PRODUCTS FOR YEARS & ALWAYS HAPPY TO SUPPORT THE BRAND. BEAVERTON GMC HAD THE VEHICLE THAT WE WERE LOOKING FOR AND MADE THE BUYING PROCESS SIMPLE AND FAST.
Vehicle information
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Reviews
Best dealership around!
Best dealership around! The kindest staff, patient and willing to help you find exactly what you are looking for. Corey was super helpful and made the process and breeze. We have purchased 4 vehicles from West Metro and I know we will be back when we are ready for another.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
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Reviews
Very Nice Small Town Dealership
I went to Rex Chevrolet to look at a used BMW. Mark and Mick were both incredibly friendly and I was treated very well. Although I did not end up buying the car, I did think the offer was fair and I would go back in a minute were I in tge market for a vehicle and this dealership had a vehicle in which I was interested. Thanks guys!
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2022 GMC Sierra 3500 AT4
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GMC Sierra 3500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 3500 AT4 | 4 Good deals | |
| 2025 GMC Sierra 3500 AT4 | $77,550 | 30 Good deals |
| 2024 GMC Sierra 3500 AT4 | $68,460 | 5 Great deals |
| 2023 GMC Sierra 3500 AT4 | $60,299 | 9 Great deals |
| 2022 GMC Sierra 3500 AT4 | $54,167 | 18 Great deals |
About the 2021 GMC Sierra 3500 AT4
AT4 shown.
- Seating
- 5
- Door count
- 4
- Drivetrain
- Four Wheel Drive
- Combined MPG
- 0
- Transmission
- 6-Speed A/T
- Engine
- 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
How much does the 2021 GMC Sierra 3500 AT4 cost?
The 2021 GMC Sierra 3500 AT4 price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 AT4 is $51,385, with pricing starting at $38,000.
What are some similar vehicles and competitors of the 2021 GMC Sierra 3500 AT4?
The 2021 GMC Sierra 3500 AT4 compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 3500 AT4 reliable?
The 2021 GMC Sierra 3500 has an average reliability rating of 4 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2021 Sierra 3500 owners.
100% of drivers recommend this car
- Comfort
- 4.5
- Interior
- 4.5
- Performance
- 5.0
- Value
- 4.0
- Exterior
- 4.5
- Reliability
- 4.0
AT4 (2 styles)
| Style | |
|---|---|
| 4WD Crew Cab 172" AT4 | 4WD Crew Cab 159" AT4 |
| Inventory price | |
| Starting at $60,500 | Starting at $60,300 |
| Combined MPG | |
| 0 | 0 |
| Engine | |
| 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) |
*Estimated payments are calculated by Cars.com and are for informational purposes only. We’ve estimated your taxes based on your provided ZIP code. These estimates do not include title, registration fees, lien fees, or any other fees that may be imposed by a governmental agency in connection with the sale and financing of the vehicle. Other taxes may apply. They do not represent a financing offer or a guarantee of credit from the seller. Actual terms vary by lender.
**Your Saved Vehicles list will be shared along with your contact information when you submit a vehicle request to a dealership. To opt out of this sharing, please view your options on Cars.com Privacy Notice.
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Denali
12 Great Deals out of 69 listings starting at $45,873
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This vehicle is certified pre-owned, backed by a manufacturer warranty, and typically undergoes a rigorous multi-point inspection to ensure quality and reliability.
This vehicle is currently in high demand given its competitive price, desirable features, and overall condition, and may have a higher chance of selling quickly.