2026 GMC Sierra 3500 HD For Sale in Collinsville OK

Prices starting at: $48,200

View photos, watch videos and get a quote on a new 2026 GMC Sierra 3500 HD in Collinsville, OK.

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2026 GMC Sierra 3500 HD Truck Woodland Green

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Learn More About Buying a 2026 GMC Sierra 3500 HD in Collinsville

Visit Mark Allen Buick GMC for a great deal on a new 2026 GMC Sierra 3500 HD. Our sales team is ready to show you all of the features that you will find in the GMC Sierra 3500 HD and take you for a test drive in the Collinsville Area. At our GMC dealership you will find competitive prices, a stocked inventory of 2026 GMC Sierra 3500 HD cars and a helpful sales team. Stop by our car dealership today and take a 2026 GMC for a spin.

2026 GMC Sierra 3500 HD AT4

MSRP$89,720
Dealer Discount$5,616
Sale Price$84,104
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$3,000
Final Price$83,092

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Coastal Dune, Interior Color: Jet Black with Kalahari accents, Perforated Front

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2026 GMC Sierra 3500 HD Denali DRW

MSRP$96,610
Dealer Discount$6,066
Sale Price$90,544
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$3,500
Final Price$87,032

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Downpour Metallic, Interior Color: Jet Black, Forge Perforated Leather seating surfac

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2026 GMC Sierra 3500 HD Denali DRW

MSRP$85,675
Dealer Discount$5,105
Sale Price$80,570
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$2,000
Final Price$80,558

Engine: 6.6L V8 Gas engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Jet Black, Forge Perforated Leather seating surfac

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2026 GMC Sierra 3500 HD Denali DRW

MSRP$96,810
Dealer Discount$6,107
Sale Price$90,703
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$3,500
Final Price$87,191

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Glacier White Tricoat, Interior Color: Jet Black, Forge Perforated Leather seating surfac

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2026 GMC Sierra 3500 HD Denali Ultimate DRW

MSRP$105,915
Dealer Discount$6,820
Sale Price$99,095
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$2,000
Final Price$99,083

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Alpine Umber, Full Grain Leather seating surfaces

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2026 GMC Sierra 3500 HD Denali Ultimate DRW

MSRP$105,915
Dealer Discount$6,820
Sale Price$99,095
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$2,000
Final Price$99,083

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Alpine Umber, Full Grain Leather seating surfaces

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2026 GMC Sierra 3500 HD Pro

MSRP$55,930
Dealer Discount$2,555
Sale Price$53,375
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$1,000
Final Price$54,363

Engine: 6.6L V8 Gas engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black, Cloth seat trim

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2026 GMC Sierra 3500 HD SLE

MSRP$73,605
Dealer Discount$4,562
Sale Price$69,043
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$5,500
Final Price$65,531

Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Jet Black, Cloth seat trim

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2026 GMC Sierra 3500 HD Denali

MSRP$82,320
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$2,000
Final Price$82,308

Engine: 6.6L V8 Gas engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Jet Black, Forge Perforated Leather seating surfac

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2026 GMC Sierra 3500 HD Denali

MSRP$81,825
Mark Allen Protection Plan$1,499
Doc Fee$489
Offers$2,000
Final Price$81,813

Engine: 6.6L V8 Gas engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black, Forge Perforated Leather seating surfac

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View All New GMC Sierra 3500 HD

Sorry, no GMC Sierra 3500 HDs are currently in stock.

We may have vehicles that have not yet posted to the website, so we request you call us at (918) 779-3679 for further assistance!

GMC (1)

Sierra 3500 HD Truck (7)

2026

Manufacturer Offer

No Monthly Payments Until Next Year for Well-Qualified Buyers When Financed w/ GM Financial

4.9% APR for 36 months
4.9% APR for 48 months
5.9% APR for 60 months
6.9% APR for 72 months

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Oct 01, 2026 through Nov 02, 2026

No Monthly Payments Until Next Year for Well-Qualified Buyers When Financed w/ GM Financial

Disclaimer(s)

Deferred monthly payments until 2027. Finance charges accrue from date of financing. Must finance with GM Financial. Down payment required at signing, if applicable. Offer not available in PA. Some customers may not qualify. Not available with lease and some other offers. 4.9% APR for 48 months for well-qualified buyers when financed w/GM Financial. Monthly payment is $22.98 for every $1000 you finance. Average example down payment is 10.0%. This is a standalone APR incentive program and not available with lease and some other offers. Must take new retail delivery by 11/02/2026. Truth in Lending Act Disclosure: Down payment will vary with APR and credit. For example, 4.9% APR with $2,500 down payment provides for 48 monthly payments of $22.98 per $1000 financed for qualified buyers. 4.9% APR for a term of 36 months corresponds to a monthly cost of $29.93 per $1000 financed. 5.9% APR for a term of 60 months corresponds to a monthly cost of $19.29 per $1000 financed. 6.9% APR for a term of 72 months corresponds to a monthly cost of $17 per $1000 financed. 6.9% APR for a term of 75 months corresponds to a monthly cost of $16.45 per $1000 financed. 6.9% APR for a term of 84 months corresponds to a monthly cost of $15.04 per $1000 financed. The rates described are for estimation purposes only; you may not be able to finance at this rate. (See Trims)
See State Disclaimer *

Manufacturer Offer

Purchase Allowance

$3,500 Cash

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Sep 30, 2026 through Nov 02, 2026

Disclaimer(s)

Not available with special financing, lease and some other offers. Must take new retail delivery by 11/02/2026. (See Trims)
See State Disclaimer *

Manufacturer Offer

Bonus Cash

$2,000 Cash

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Sep 30, 2026 through Nov 02, 2026

Disclaimer(s)

Not available with some other offers. Must take new retail delivery by 11/02/2026. (See Trims)
See State Disclaimer *

Manufacturer Offer

Purchase Allowance

$1,500 Cash

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Sep 30, 2026 through Nov 02, 2026

Disclaimer(s)

Not available with special financing, lease and some other offers. Must take new retail delivery by 11/02/2026. (See Trims)
See State Disclaimer *

Manufacturer Offer

Purchase Allowance

$1,000 Cash

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Sep 30, 2026 through Nov 02, 2026

Disclaimer(s)

Not available with special financing, lease and some other offers. Must take new retail delivery by 11/02/2026. (See Trims)
See State Disclaimer *

Manufacturer Offer

GM Military Offer

$500 Offer

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Jan 03, 2026 through Jan 04, 2027

Disclaimer(s)

Eligible military personnel includes Active Duty members, Reservists, National Guard members, Veterans and Retirees of the U.S. Army, Navy, Air Force, Marine Corps and Coast Guard. Eligible participants are able to sponsor their spouse. At participating dealers only. Visit gmmilitaryappreciation.com for program eligibility details and for a list of eligible vehicles. Not available with some other offers. Must provide authorization number to participating dealer prior to or at time of vehicle delivery to receive offer. Must take new retail delivery by 01/04/2027. (See Trims)
See State Disclaimer *

Manufacturer Offer

GM First Responder Offer

$500 Offer

Applies to this new 2026 GMC Sierra 3500 HD

Offer only valid Jan 03, 2026 through Jan 04, 2027

Disclaimer(s)

Must be a current Firefighter, Police, EMT/Paramedic, or 911 Dispatcher. First Responders employed by federal, state or municipal governments may be subject to restrictions that limit their ability to accept this offer. Accordingly, this offer is void unless permitted by applicable federal, state and municipal laws, regulations, rules, ordinances, policies, codes of conduct, and other directives or standards regarding ethics and gift acceptance by the applicable federal, state or municipal employees. By accepting this offer, you verify that doing so complies with all laws, regulations, policies or other restrictions regarding ethics or gift acceptance that apply to you. Eligible participants are able to sponsor their spouse. At participating dealers only. Visit gmfirstresponderappreciation.com for program eligibility details and for a list of eligible vehicles. Not available with some other offers. Must provide authorization number to participating dealer prior to or at time of vehicle delivery to receive offer. Must take new retail delivery by 01/04/2027. (See Trims)
See State Disclaimer *

Interested in a different GMC? Click a link below and find the GMC that fits your lifestyle.

GMC Savana Cutaway 4500

Disclaimer: The Manufacturer’s Suggested Retail Price excludes tax, title, license, dealer fees and optional equipment. Dealer sets final price.

¹Dealer Discount applied to everyone

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2026 GMC Sierra 3500 HD For Sale

Prices starting at: $48,200

View photos, watch videos and get a quote on a new 2026 GMC Sierra 3500 HD in Collinsville, OK.

Request More Info

2026

No Monthly Payments Until Next Year for Well-Qualified Buyers When Financed w/ GM Financial

Purchase Allowance

Bonus Cash

Purchase Allowance

Purchase Allowance

GM Military Offer

GM First Responder Offer