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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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New and used
2026 GMC Sierra 1500 SLT trucks
for sale
near
Johnsburg, IL
- 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.






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Great Team in all departments
Team was Great James and Financing department went above and beyond for us






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Excellent customer service and great to work with!
Excellent customer service and great to work with! They even delivered my vehicle to me. Nick in sales is the best from start to finish!






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
VVVal
Kim was incredible in helping me get my repairs covered by my extended warranty! Details of service were provided and car was ready when needed.






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Great Dealership and service team .
Jim Sprandel sevice mgr. very nice man and also explains everything to you clearly.The rest of the staff was also very pleasant. I would give this dealership 10 stars if I could. My car was washed for me and I needed it considering it was a cold winter day.

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
The entire team at this location far exceeded our
The entire team at this location far exceeded our expectations! Our sales consultant Sandi was extremely easy to work with, and he had our best interest in mind when working on a deal for a new truck. When it came time to financing, Alex ensured we got in and out with exactly what we needed. He provided us personal stories bridging to his recommendations that help guide my wife and I in a direction that surpassed what we originally had in mind. Finally, throughout the visit Edgar and Manny ensured we felt comfortable as we worked though a deal that would ultimately have us driving home without any doubts in a vehicle that can grow with my family. They were the cherry on top to an already excellent experience. Thank you from the bottom of our hearts for such a great team!

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
I really appreciate the straight-forward buying process I
I really appreciate the straight-forward buying process I found at Napleton Schaumburg GMC. Thank you to Yiannis for answering all my questions! Best- Mark

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
My salesman Esad was great.
My salesman Esad was great. He was very knowledgeable. Everyone was very friendly and helpful.






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Bill was fantastic to work with!
Bill was fantastic to work with! Whole process took only a couple of hours and everyone was very helpful. Pricing was transparent and they worked with me to get me best interest rate possible.






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Excellent service Professional service Quick
Excellent service Professional service Quick service Polite customer service Excellent customer communication Very detailed repairs

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
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New
2026 GMC Sierra 1500 SLT
Vehicle information
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New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Chris does an outstanding job every time I visit.
Chris does an outstanding job every time I visit. He is very accommodating and always aware of my needs and my time. Only place I service all my vehicles (3) and drive 30 minutes even though there are 2 Chevy dealers much closer.

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
Reviews
Buying my Camaro from Castle Chevrolet in McHenry was an
Buying my Camaro from Castle Chevrolet in McHenry was an outstanding experience from start to finish. I worked with Eric Loredo, who set the tone by doing a full virtual walk around and video of the car before I arrived, answering all my questions in real time. When my wife and I landed at ORD, the car was spotless and ready to go. Finance Manager Mike Lazzara had all documents sent ahead so I could DocuSign, making the delivery quick and smooth. Sales Manager Matt Knudson, GSM Jerry Spanier, and Andrew Sytsma (who wasn’t my salesman but still took time to chat and share product knowledge) all played a part in making this one of the easiest purchases I’ve ever had. The team knew my previous car was totaled in a tornado, and they went above and beyond to make this out-of-state transaction simple and stress-free. Eric and the entire Castle team reminded me that buying a car doesn’t have to be a battle. I would absolutely buy from them again.

New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features






New
2026 GMC Sierra 1500 SLT
Vehicle information
Features
About the 2026 GMC Sierra 1500 SLT
SLT shown.
- Seating
- 5
- Door count
- 4
- Drivetrain
- Rear Wheel Drive
- Combined MPG
- 17
- Transmission
- 10-Speed A/T
- Engine
- 305.0-hp, 3.0-liter, Straight 6 Cylinder Engine (Diesel Fuel)
How much does the 2026 GMC Sierra 1500 SLT cost?
The 2026 GMC Sierra 1500 SLT price depends on optional features. Prices typically start at $54,900.
What is the MPG of the 2026 GMC Sierra 1500 SLT?
The 2026 GMC Sierra 1500 SLT offers up to 16 MPG in city driving and 20 MPG on the highway for a combined rating of 17 MPG.
These figures are based on EPA mileage ratings and are for comparison purposes only. The actual mileage will vary depending on the selected vehicle options, driving conditions, driving habits, vehicle maintenance, and other factors.
What are some similar vehicles and competitors of the 2026 GMC Sierra 1500 SLT?
The 2026 GMC Sierra 1500 SLT compares to and/or competes against the following vehicles:
SLT (3 styles)
Style | ||
---|---|---|
2WD Crew Cab 147" SLT | 4WD Crew Cab 147" SLT | 4WD Crew Cab 157" SLT |
Inventory price | ||
Starting at $54,900 | Starting at $58,000 | Starting at $58,700 |
Combined MPG | ||
17 | 16 | 16 |
Engine | ||
305.0-hp, 3.0-liter, Straight 6 Cylinder Engine (Diesel Fuel) | 420.0-hp, 6.2-liter, 8 Cylinder Engine (Gasoline Fuel) | 420.0-hp, 6.2-liter, 8 Cylinder Engine (Gasoline 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 1500 trims
-
GMC Sierra 1500 2026 Elevation
82 listings starting at $44,000
-
GMC Sierra 1500 2026 Denali
35 listings starting at $62,250
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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.