Prices starting at: $48,200

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

Visit Fairfield's 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 KEENE 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 Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,090
  • Dealer Discount$911
  • Discounted Price$90,179
  • Doc Fees$399
  • Sale Price$90,578
  • Offers$1,000
  • Final Price$89,578
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,585
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Titanium Rush Metallic, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,585
  • Dealer Discount$916
  • Discounted Price$90,669
  • Doc Fees$399
  • Sale Price$91,068
  • Offers$1,000
  • Final Price$90,068
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,585
  • Dealer Discount$916
  • Discounted Price$90,669
  • Doc Fees$399
  • Sale Price$91,068
  • Offers$1,000
  • Final Price$90,068
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Sterling Metallic, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$92,355
  • Dealer Discount$4,694
  • Discounted Price$87,661
  • Doc Fees$399
  • Sale Price$88,060
  • Offers$1,000
  • Final Price$87,060
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,860
  • Dealer Discount$919
  • Discounted Price$90,941
  • Doc Fees$399
  • Sale Price$91,340
  • Offers$1,000
  • Final Price$90,340
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated Front
View Details
2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,860
  • Dealer Discount$919
  • Discounted Price$90,941
  • Doc Fees$399
  • Sale Price$91,340
  • Offers$1,000
  • Final Price$90,340
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated Front
View Details
2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,860
  • Dealer Discount$4,096
  • Discounted Price$87,764
  • Doc Fees$399
  • Sale Price$88,163
  • Offers$1,000
  • Final Price$87,163
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated Front
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2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$92,355
  • Dealer Discount$2,771
  • Discounted Price$89,584
  • Doc Fees$399
  • Sale Price$89,983
  • Offers$1,000
  • Final Price$88,983
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Onyx Black, Interior Color: Jet Black with Kalahari accents, Perforated Front
View Details
2026 GMC Sierra 3500 HD Truck

2026 GMC Sierra 3500 HD AT4

  • MSRP$91,860
  • Dealer Discount$2,756
  • Discounted Price$89,104
  • Doc Fees$399
  • Sale Price$89,503
  • Offers$1,000
  • Final Price$88,503
Engine: 6.6L Duramax Turbo-Diesel V8 engine, Transmission: Automatic, Exterior Color: Summit White, Interior Color: Jet Black with Kalahari accents, Perforated Front
View Details
View All New GMC Sierra 3500 HD
2025 GMC Sierra 3500 HD Truck

2025 GMC Sierra 3500 HD Pro

Engine: 6.6L V8 Gas engine, Transmission: Automatic, Mileage: 28,895 miles, Exterior Color: Onyx Black, Interior Color: Jet Black, Cloth seat trim
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View All Pre-Owned GMC Sierra 3500 HD

GMC (1)

Sierra 3500 HD Truck (5)

2026

Manufacturer Offer

No Monthly Payments for 90 Days for Well-Qualified Buyers When Financed w/ GM Financial

  1. 4.9% APR for 36 months
  2. 4.9% APR for 48 months
  3. 5.9% APR for 60 months
  4. 6.9% APR for 72 months
  • Applies to this new 2026 GMC Sierra 3500 HD

No Monthly Payments for 90 Days for Well-Qualified Buyers When Financed w/ GM Financial

Disclaimer(s)
  • Deferred monthly payments for 90 days. 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%. Not available with leases and some other offers. Must take new retail delivery by 09/30/2026. 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. 6.9% APR for a term of 84 months corresponds to a monthly cost of $15.04 per $1000 financed. 6.9% APR for a term of 72 months corresponds to a monthly cost of $17 per $1000 financed. 5.9% APR for a term of 60 months corresponds to a monthly cost of $19.29 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

  1. $3,500 Cash
  • Applies to this new 2026 GMC Sierra 3500 HD

Disclaimer(s)
  • Not available with special financing, lease and some other offers. Must take new retail delivery by 09/30/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Bonus Cash

  1. $2,000 Cash
  • Applies to this new 2026 GMC Sierra 3500 HD

Disclaimer(s)
  • Not available with some other offers. Must take new retail delivery by 09/30/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Purchase Allowance

  1. $1,500 Cash
  • Applies to this new 2026 GMC Sierra 3500 HD

Disclaimer(s)
  • Not available with special financing, lease and some other offers. Must take new retail delivery by 09/30/2026. (See Trims)
  • See State Disclaimer *
Manufacturer Offer

Purchase Allowance

  1. $1,000 Cash
  • Applies to this new 2026 GMC Sierra 3500 HD

Disclaimer(s)
  • Not available with special financing, lease and some other offers. Must take new retail delivery by 09/30/2026. (See Trims)
  • See State Disclaimer *

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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