Detailed specs and features for the 2026 GMC Sierra 2500HD Diesel Denali Ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders,...

Compare all 2026 GMC Sierra 2500 features and specs side-by-side in one place. Get price, fuel economy, tech and safety features, warranty info and more for each and every 2026 Sierra...

GMC backs these features with a factory warranty for 36 month/36,000 miles. See below for a complete list of Sierra 2500HD specifications or select a trim to see what comes standard on each.

Research the 2026 GMC Sierra 2500 at Cars.com and find specs, pricing, MPG, safety data, photos, videos, reviews and local inventory.

Learn the ins and outs about the new 2026 GMC Sierra 2500HD 4WD Crew Cab 159" Denali Ultimate. Find information on performance, specs, engine, safety and more.

Mar 9, 2025 · The base engine is a potent 6.6-liter Duramax V8 turbo-diesel, generating 445 horsepower and 910 lb-ft of torque. This engine is paired with a robust 10-speed Allison automatic transmission …

There are seven trims for the 2026 model year: Pro, SLE, SLT, AT4, AT4X, Denali, and Denali Ultimate. Since the GMC Sierra 2500HD got a major refresh in 2024 that included refreshed exterior styling, …

Jan 6, 2025 · Properly equipped and capable of towing up to 36,000 pounds, it won’t get away with hard work but can be downright luxurious in its Denali and Denali Ultimate trims. Having a major update for …

What are the GMC Sierra 2500HD models?

It offers 401 horsepower and 464 pound-feet of torque. Available is the Duramax 6.6-liter V8 turbodiesel with 470 horsepower and a peak torque of 975 pound-feet. Torque is up 25% at lower rpm for …