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Used
2021 GMC Sierra 3500 SLT 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 SLT
Vehicle information
Features
Reviews
Wyatt was extremely helpful with the whole process!
Wyatt was extremely helpful with the whole process! He even arranged for my vehicle to be delivered to me! He made the whole process very quick and simple!
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 SLT
Vehicle information
Features
Reviews
vibration in steering wheel/tire inspection
Vehicle inspected due to vibration in the steering wheel. Tires x4 needed. Tire prices/info given and discussed. Very helpful, though I found tires elsewhere at lower price, I will return for further services.
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 SLT
Vehicle information
Features
Reviews
I would definitely recommend Tim Short Ford.
I would definitely recommend Tim Short Ford. They were easy to deal with and knowledgeable. It was a quick, painless process. Very satisfied with the experience.
Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Fastest and easiest vehicle purchase I ever made.
Fastest and easiest vehicle purchase I ever made. Jake was excellent and they were fair on my trade.
Vehicle information
Features
Reviews
Why I love Russ Milne
My first Ford I purchased from Russ Milne, 1967 Fairlane GTA. Loved that car. The salesman at that time was “Doc” Wilson. We have been dealing with Kellie Kraemer for many years now and we love her ♥️ We followed her from a different dealer. We would follow her anywhere. Her husband and son are always mosthelpful also. Thank You Kellie for being the best Barbara and Randy Frank
Used
2021 GMC Sierra 3500 SLT
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 SLT
Vehicle information
Features
Reviews
I knew what I was looking for and got to test drive as
I knew what I was looking for and got to test drive as soon as the vehicle showed up at the lot. Salesman and manager helped me move things along without any issues. I got reasonable value from my trad-in and I'm looking forward to picking up my new to me Expedition next week!
Vehicle information
Features
Reviews
I was in the market for a new GMC pickup and this dealer
I was in the market for a new GMC pickup and this dealer had one that I was interested in when I visited them. I worked with Joe and he gave me as good a deal as I could get at other dealerships but I liked how friendly everyone was at this dealership and I did not feel pressured to make a purchase.
Used
2021 GMC Sierra 3500 SLT
Vehicle information
Features
Reviews
Outstanding Experience!
Outstanding Experience! Ask for Dylan Hupp and you will not be disappointed. Polite and respectful, answered all my questions and was there to assist! Very happy with the purchase of our car for our son. Kevin and Jim equally as nice and got the deal done fast. We will be back on the lot shopping for more cars. Thanks Guys! Sherwyn Simon
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.
There are 20 matching cars close to your year range.
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GMC Sierra 3500 prices by year
| Model year | Average price | Deals |
|---|---|---|
| 2026 GMC Sierra 3500 SLT | 2 Good deals | |
| 2025 GMC Sierra 3500 SLT | $69,684 | 6 Great deals |
| 2024 GMC Sierra 3500 SLT | $62,874 | 27 Good deals |
| 2019 GMC Sierra 3500 SLT | $45,655 | 19 Good deals |
About the 2021 GMC Sierra 3500 SLT
SLT shown.
- Seating
- 5
- Door count
- 4
- 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 SLT cost?
The 2021 GMC Sierra 3500 SLT price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2021 Sierra 3500 SLT is $49,444, with pricing starting at $44,999.
What are some similar vehicles and competitors of the 2021 GMC Sierra 3500 SLT?
The 2021 GMC Sierra 3500 SLT compares to and/or competes against the following vehicles:
Is the 2021 GMC Sierra 3500 SLT 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
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.
GMC Sierra 3500 trims
-
GMC Sierra 3500 2021 Denali
12 Great Deals out of 67 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.