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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 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 Denali
Vehicle information
Features
Reviews
We recently bought a new Grand Highlander, Zack was our
We recently bought a new Grand Highlander, Zack was our sales man had a great buying experience working with Zack and Dan Deery Toyota. We were looking to buy a Highlander and Zack mentioned a Grand Highlander to us and really glad he did, we love the extra room with the Grand Highlander.
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
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.
GMC Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Can never say enough about how glad I am that I chose to
Can never say enough about how glad I am that I chose to return to Thompson's for my second GMC purchase. The first time Bobby D. was so helpful that I requested him 2 years later when I returned. He does not pressure you. He finds out what you are interested in and why, how will you use it? He then gives you options that are available. He was able to answer all kinds of questions about how the vehicle operated etc. He is so likeable. I wish everyone who deals with the public was as polite, understanding, knowledgeable and on and on as he is. THANK YOU BOBBY! Oh Yeah, I like my 2 vehicles too!!
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very good our salesman was excellent.
Very good our salesman was excellent. Ed was very good. He was very informative and a big help with the purchase. Finance department was also very helpful.
Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Knowledgeable, easy process, paperwork was quick to
Knowledgeable, easy process, paperwork was quick to complete. Would recommend to anyone buying a car in the area. Wasn?t pushy and wanted to make sure I got everything I was looking for in the car I purchased
Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
I requested info regarding a used car.
I requested info regarding a used car. The salesperson was honest, upfront and I believe trustworthy
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
The service was very good and the staff was knowledgeable
The service was very good and the staff was knowledgeable and friendly. I was notified when to come pick up my car. I was offered the opportunity to wait in their lounge where they provide a variety of food and drinks for their customers.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Aaron, our salesman and Kim the online consultant were
Aaron, our salesman and Kim the online consultant were great. Jeff was a bit indifferent and unwilling to barter too much. Otherwise, I was happy with the overall experience.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
This dealership doesn’t negotiate price.
This dealership doesn’t negotiate price. I randomly walked in one day and Michel helped me out, he sent me different car options over a few days and ultimately helped me purchase a great car. It was a quick and easy process which I appreciated and also a no pressure environment which was nice.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very pleasant experience at Vera car dealership it was my
Very pleasant experience at Vera car dealership it was my first time there. Every one was so nice to us Mr.Kamel the saleperson was so friendly with us he made us fill at home it was nice doing business with him a very pleasant person to talk to my time at Vera Buick GMC was GREAT.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
El servicio que nos ofrecieron muy satisfactorio y
El servicio que nos ofrecieron muy satisfactorio y rapidez, la atencion de Mo y Victoria fue muy cordial y durante el tramite de la venta del auto nos dieron alternativas muy favorables para darnos un buen deal. gracias por brindarnos su confianza en nuestra compra.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
They were very courteous and helpful!
They were very courteous and helpful! They also gave me a great deal! I highly recommend!
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
The entire process was smooth, efficient and extremely
The entire process was smooth, efficient and extremely pleasant. No pressure and no surprises and the entire team was very friendly and helpful. An excellent experience in every way.
Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
Had a vehicle give me so trouble a month after I bought
Had a vehicle give me so trouble a month after I bought it , had it serviced in Burton Chevy and Adam really went above and beyond for me and Brandon made it happen ! Thank you for ur help it’s much appreciated!!
Used
2021 GMC Sierra 3500 SLE
Vehicle information
Features
Reviews
Excellent experience as soon as I walked in the door.
Excellent experience as soon as I walked in the door. No pushy salesmen. Great place.
Certified
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
On November 19,2025 my wife and I went to Dick Smith Ford
On November 19,2025 my wife and I went to Dick Smith Ford in Columbia SC to look at a 2025 Maverick. We met Doug Truett and told him what we were looking for. He showed us a Carbonized Grey Metalic Maverick, we test drove it, and we well pleased with the truck. After some negotiating he mentioned that they had another one in Azure Grey and we should also give it a look. We looked, we drove, we liked so we purchased it. Doug was very professional. He showed us the MSRP, he did not put any added charges on it. I would recommend Doug Truett and Dick Smith Ford to anyone who wants to buy a new vehicle.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
My experience was great.
My experience was great. The problem with my car was explained in terms I understood. Nick was very friendly and kind. I still need to get a new battery but right now I can't afford it.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Lalo was very friendly and very helpful.
Lalo was very friendly and very helpful. Made the whole experience a breeze and explained everything very well. Would shop with him again. 5 stars satisfaction.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Had a great experience buying my Jeep.
Had a great experience buying my Jeep. Would definitely come back to purchase from them again.
GMC Sierra 3500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 3500 | $84,080 | 8 Good deals |
| 2025 GMC Sierra 3500 | $72,964 | 36 Great deals |
| 2024 GMC Sierra 3500 | $68,768 | 37 Great deals |
| 2023 GMC Sierra 3500 | $58,442 | 83 Great deals |
| 2022 GMC Sierra 3500 | $56,233 | 61 Great deals |
| 2020 GMC Sierra 3500 | $51,608 | 16 Great deals |
| 2019 GMC Sierra 3500 | $44,159 | 8 Great deals |
| 2018 GMC Sierra 3500 | $45,408 | 30 Good deals |
| 2017 GMC Sierra 3500 | $39,967 | 19 Good deals |
About the 2021 GMC Sierra 3500
Base shown (base trim).
- Seating
- 2
- Door count
- 2
- Drivetrain
- Rear-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 cost?
The 2021 GMC Sierra 3500 price depends on several factors, including the trim level, optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 is $53,016, with pricing starting at $33,895.
Is the 2021 GMC Sierra 3500 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.
Is the 2021 GMC Sierra 3500 a good truck?
Below are the Cars.com consumer ratings for the 2021 GMC Sierra 3500.
- Comfort 4.5
- Interior 4.5
- Performance 5.0
- Value 4.0
- Exterior 4.5
- Reliability 4.0
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) |
Base (8 styles)
| Style | |||||||
|---|---|---|---|---|---|---|---|
| 2WD Double Cab 162" | 4WD Double Cab 162" | 4WD Crew Cab 172" | 4WD Crew Cab 159" | 2WD Crew Cab 159" | 2WD Crew Cab 172" | 4WD Reg Cab 142" | 2WD Reg Cab 142" |
| Inventory price | |||||||
| Starting at $40,200 | Starting at $43,000 | Starting at $44,800 | Starting at $44,600 | Starting at $41,800 | Starting at $42,000 | Starting at $40,200 | Starting at $37,400 |
| Combined MPG | |||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 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) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) |
Denali (2 styles)
| Style | |
|---|---|
| 4WD Crew Cab 159" Denali | 4WD Crew Cab 172" Denali |
| Inventory price | |
| Starting at $66,700 | Starting at $66,900 |
| 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) |
SLE (8 styles)
| Style | |||||||
|---|---|---|---|---|---|---|---|
| 2WD Double Cab 162" SLE | 4WD Double Cab 162" SLE | 4WD Reg Cab 142" SLE | 2WD Reg Cab 142" SLE | 4WD Crew Cab 159" SLE | 4WD Crew Cab 172" SLE | 2WD Crew Cab 159" SLE | 2WD Crew Cab 172" SLE |
| Inventory price | |||||||
| Starting at $45,000 | Starting at $47,800 | Starting at $45,600 | Starting at $42,800 | Starting at $49,400 | Starting at $49,600 | Starting at $46,600 | Starting at $46,800 |
| Combined MPG | |||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 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) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) | 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) |
SLT (4 styles)
| Style | |||
|---|---|---|---|
| 4WD Crew Cab 172" SLT | 2WD Crew Cab 159" SLT | 2WD Crew Cab 172" SLT | 4WD Crew Cab 159" SLT |
| Inventory price | |||
| Starting at $57,600 | Starting at $54,600 | Starting at $54,800 | Starting at $57,400 |
| Combined MPG | |||
| 0 | 0 | 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) | 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.
Research the 2021 GMC Sierra 3500
Compare the 2021 GMC Sierra 3500
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Denali
26 Great Deals out of 105 listings starting at $36,000
-
GMC Sierra 3500 2021 AT4
3 Great Deals out of 25 listings starting at $37,990
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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.
