Save your search and get notified when new inventory arrives.
Contact seller
Customize your budget
*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.
About your privacy: Cars.com is asking for your ZIP and credit rating because it helps us to make an educated guess at your sales tax and loan interest. These two factors can greatly change your monthly payment.
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
They were very courteous and helpful!
They were very courteous and helpful! They also gave me a great deal! I highly recommend!
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
Great work always!
Great work always! They are a pleasure to do business with. We will buy and service only with Ray Skillman. Thanks for always taking care of our automotive needs.
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 Denali
Vehicle information
Features
Reviews
I like my rep David chao.
I like my rep David chao. He is great. Very helpful, not pushy. Facility is nice and spacious. Overall good experience. I highly recommend this dealership with my rep
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Jason Brumpton was outstanding to work with.
Jason Brumpton was outstanding to work with. His communication was prompt, clear, and consistent from start to finish. He took the time to break down the service details in a way that made everything easy to understand, and he went above and beyond to help troubleshoot when necessary. Professional, thorough and patient.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
BROKE DA SCALE PLAYA!
BROKE DA SCALE PLAYA! best experience loving the new car and I would definitely recommend Jarret to anyone looking to find their dream car :) I ended up finding something that fits my family perfectly
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Sales, Service, Finance were all very prompt, pleasant
Sales, Service, Finance were all very prompt, pleasant and professional. Couldn’t have asked for a better experience.
Used
2021 GMC Sierra 3500 Base
Vehicle information
Features
Reviews
My salesman was Evan Williams.
My salesman was Evan Williams. I can’t praise him enough!! He was beyond kind, courteous and so personable and helpful. I’ve been a Stoops customer for over 25 years. Wouldn’t shop or buy anywhere else. Their service department is also outstanding. I’ve bought both new and used over the years. I highly recommend Stoops!
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
The buying process was so easy.
The buying process was so easy. I was preapproved. We took care of most things over the phone. I came in. They had all the paperwork ready I signed and was out the door probably within 30 to 45 minutes
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
Molly truly cares that I have a good experience
Molly in service is the Best....Molly always has a smile on her face and ready to help all the time. I always tell my friends to go Starling Buick and ask for Molly...
Used
2021 GMC Sierra 3500 AT4
Vehicle information
Features
Reviews
I had been driving a 2016 Chevy trax for almost 10 years
I had been driving a 2016 Chevy trax for almost 10 years and knew I wanted another Trax. I like the new modern look ot the 2026 Trax. I told the salesman what I wanted inside the car and he had a car ready for me to test drive when I arrived at the dealership, Emich Chevrolet in Lakewood, Co. The buying process was amenable. I am happy with my purchase and recommend this dealership.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
I like the personal stuff they do for me when I'm having
I like the personal stuff they do for me when I'm having an oil change or just servicing my maverick and f-150!!
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Very happy with my experience at Buerkle Honda.
Very happy with my experience at Buerkle Honda. Parker Ringold was great finding a vehicle that fit my list of priorities and Tong Hang got me an amazing APR.
Used
2021 GMC Sierra 3500 SLE
Vehicle information
Features
Reviews
It was great working with David K.
It was great working with David K. He had a ton of information and new the santa fe and it's features very well. No pressure sales from him.
Used
2021 GMC Sierra 3500 Denali
Vehicle information
Features
Reviews
Mall of Georgia Mini is outstanding!
Mall of Georgia Mini is outstanding!! Gevarius and service staff were above and beyond!! We have had our Mini since November of ?24 and truly love it!! Would highly recommend Mall of Georgia Mini with Gevarius!!
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 Base
Vehicle information
Features
Reviews
This was my second time purchasing a car from the
This was my second time purchasing a car from the dealership and had another great experience. Dan and Frankie were very helpful in picking out a car and were very honest which was important to me. I highly recommend shopping here for a great used vehicle.
Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Aryan was a very helpful salesman gave me many options
Aryan was a very helpful salesman gave me many options and compared all of them one by one so it made my first car buying experience easy.
Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Every person involved in the engine replacement of our
Every person involved in the engine replacement of our family truck should get some sort of bonus and/or recognition for saving our family vacation. They somehow pulled enough strings to get my new engine ordered, shipped, installed, and my truck back to me in about 2 weeks. That allowed us to have a vehicle large enough to tow a boat and have 4 adults comfortably riding down the road.
Used
2021 GMC Sierra 3500 SLE
Vehicle information
Features
Reviews
The staff at Johnson Brothers Ford were superb!
The staff at Johnson Brothers Ford were superb! I sent a message with my interest through cars.com Sunday and they responded first thing (like 0830am) Monday. Because of my job, I could not get there until the evening, but that was no problem. They are open until 8pm!! So I went up there and the staff was friendly, explained every step of the process, and even stayed after hours to ensure I was happy with my purchase. Due to timing, I chose to come back the next evening to bring the new SUV home, but that was no problem for them :) They were even able to modify my contract last minute to include gap insurance l, which I appreciated beyond words!! Mike and the whole team made me feel very welcome and worked with the needs I had. I will and would definitely recommend them to anyone!!
GMC Sierra 3500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 3500 | $81,424 | 6 Great deals |
| 2025 GMC Sierra 3500 | $71,549 | 28 Great deals |
| 2024 GMC Sierra 3500 | $70,091 | 35 Great deals |
| 2023 GMC Sierra 3500 | $57,653 | 84 Great deals |
| 2022 GMC Sierra 3500 | $55,214 | 69 Great deals |
| 2020 GMC Sierra 3500 | $51,460 | 13 Great deals |
| 2019 GMC Sierra 3500 | $44,057 | 9 Great deals |
| 2018 GMC Sierra 3500 | $42,191 | 46 Good deals |
| 2017 GMC Sierra 3500 | $40,586 | 25 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 $51,925, with pricing starting at $24,835.
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.
Similar Cars
-
Chevrolet Silverado 2500 for sale
52 Great Deals out of 511 listings starting at $18,900
-
Chevrolet Silverado 3500 for sale
32 Great Deals out of 177 listings starting at $22,890
-
Ford F-350 for sale
56 Great Deals out of 288 listings starting at $14,900
-
Ford F-450 for sale
6 Great Deals out of 73 listings starting at $32,995
-
GMC Sierra 2500 for sale
33 Great Deals out of 362 listings starting at $23,495
-
RAM 3500 for sale
31 Great Deals out of 200 listings starting at $24,990
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 70 listings starting at $32,900
2021 GMC Sierra 3500 by cab style
2021 GMC Sierra 3500 by fuel type
- ${price_badge()}
- ${ami_badge()}
- ${battery_badge()}${ev_report_link()}
- ${hot_car_badge()}
- ${award_badge()}
- ${cpo_badge()}
${price_badge_description}
${ami_badge_description}
The EV Battery Rating is based on this vehicle's current expected range relative to the vehicles expected range when new. ${battery_badge_text}
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.