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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
Had a very good experience with Ty dealing on our used
Had a very good experience with Ty dealing on our used van. Would recommend this dealership highly
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 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.
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
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
Reviews
Josie me ayudó con la compra de mi primer carro un
Josie me ayudó con la compra de mi primer carro un Rubicon Estoy feliz el mejor servicio al cliente
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
Mike Cole took is fantastic and made a stressful
Mike Cole took is fantastic and made a stressful situation easy. My mom came in and he walked her through the process and was not pushy at all. He really made things enjoyable...well as enjoyable as buying a car can be. But we will 100% come back to Dave Arbogast and work with Mike in the future.
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
I have been to a few different dealerships in Fort Wayne
I have been to a few different dealerships in Fort Wayne and around the country and every purchase me or my family has made has been the best from Kelley. My most current purchase, 2017 Chevrolet Equinox, was very smooth even though I was not quite ready I could not pass up this deal I got. Jacob and his coworkers were very accommodating and patient.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
always professional and through service.
always professional and through service. Very courteous and helpful staff. Very pleased with care of my vehicle. Clean and pleasant facility. I always feel well cared for.
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
The staff is very knowledgeable, and friendly.
The staff is very knowledgeable, and friendly. Dan went above and beyond to help with a problem that developed during a software update on my Suburban. Thank you! Highly recommend!
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Service writer was VERY good, and straight forward and
Service writer was VERY good, and straight forward and honest. I appreciate those values in a customer service agent. I will be back again, and again, and again.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
This has been the second vehicle we have purchased from a
This has been the second vehicle we have purchased from a Luther dealer and I think we may ave found our preferred dealer for life. They always make the car buying process smooth and as painless as possible and are available for any questions during the process.
Used
2021 GMC Sierra 3500 SLE
Vehicle information
Features
Reviews
Service department is awesome.
Service department is awesome. Great service, and on time! Always use Tasca for our routine car maintenance.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
Sincere, Patient service writer and technician.
Abby and Shawn in service were excellent. They both were patient with all my questions, provided credible answers, and, upon our approval of the repairs, had them done within 24-hours. They went the extra mile to have the car test-driven both before (to confirm our reported symptoms) and after the repair (to confirm problems had been resolved). Ask for Abby when you have an auto service need.
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
Seemless transaction from start to finish on my 2025 Ram
Seemless transaction from start to finish on my 2025 Ram Promaster. I?m a contractor and needed a new work van. It was ready just in time for the EOY
Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
CJ was just the right salesman for us.
CJ was just the right salesman for us. His personality is great! The best thing we liked about CJ was he made sure that we had all the information we needed and that he showed us the cars we wanted to see. CJ listened to us and absolutely came through for us. This is our fourth vehicle that we bought at Preston Kia and I’m sure not the last, great Dealership! Thanks CJ for all your help and for being so wonderful to work with we appreciate you. Gary and Connie Danielson
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
Amazing experience with the sales and financing team.
Amazing experience with the sales and financing team. Got me the exact vehicle I wanted for a great price. No hassle or pressure to buy something I didn't want. Hightly recommend.
GMC Sierra 3500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 3500 | $83,876 | 5 Great deals |
| 2025 GMC Sierra 3500 | $78,488 | 27 Great deals |
| 2024 GMC Sierra 3500 | $69,253 | 28 Great deals |
| 2023 GMC Sierra 3500 | $59,358 | 55 Great deals |
| 2022 GMC Sierra 3500 | $56,750 | 64 Great deals |
| 2020 GMC Sierra 3500 | $51,718 | 11 Great deals |
| 2019 GMC Sierra 3500 | $45,220 | 8 Great deals |
| 2018 GMC Sierra 3500 | $45,305 | 5 Great deals |
| 2017 GMC Sierra 3500 | $40,234 | 5 Great 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 $53,465, with pricing starting at $13,795.
What are some similar vehicles and competitors of the 2021 GMC Sierra 3500?
The 2021 GMC Sierra 3500 compares to and/or competes against the following vehicles:
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.
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Research the 2021 GMC Sierra 3500
Compare the 2021 GMC Sierra 3500
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Denali
14 Great Deals out of 118 listings starting at $39,999
-
GMC Sierra 3500 2021 AT4
3 Great Deals out of 23 listings starting at $37,990
2021 GMC Sierra 3500 by body style
2021 GMC Sierra 3500 by fuel type
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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.
