2026 GMC Sierra HD Performance

If you’ve been looking for a heavy-duty work truck near Phoenix, Glendale, or Surprise, a 2026 GMC Sierra HD is an excellent option. Available in two grades—the 2500 HD and 3500 HD—plus a panoply of configurations and trim levels, the Sierra HD pairs professional-grade capability with premium comfort. Whether you’re hauling equipment to a job site in Scottsdale or towing a fifth-wheel trailer across the Arizona desert, this truck is engineered to excel. In this overview of the Sierra HD performance, the team at Liberty GMC, Inc. will cover the GMC Sierra HD towing capacity and engine choices, including the GMC Sierra HD diesel and gasoline engines. Keep reading below to learn more about the 2026 Sierra HD capabilities, then contact us to schedule a test-drive in Peoria.

2026 GMC Sierra HD Diesel & Gasoline Engines

There are two available options for the 2026 Sierra HD near Sun City and Avondale: a 6.6L V8 engine and a 6.6L Duramax V8 Turbo-Diesel that maximizes torque for extra-large loads. Both engines are now mated to the legendary Allison® 10-speed automatic transmission for smoother shifts and better trailering control. See the comparison between the GMC Sierra HD diesel and gasoline engines below.

6.6L V8 Gasoline Engine

• Horsepower: 401 hp
• Torque: 464 lb-ft
• Rear axle ratio: 3.73
• Transmission: Allison® 10-speed automatic

6.6L Duramax V8 Turbo-Diesel Engine

The available GMC Sierra HD diesel is the choice for maximum muscle, featuring an engine after-run feature for cooling performance and an integrated exhaust brake to assist with steep descents.

• Horsepower: 470 hp
• Torque: 975 lb-ft
• Rear axle ratio: 3.42
• Transmission: Allison® 10-speed automatic
• Exhaust brake & Engine block heater

2026 GMC Sierra HD Towing Capacity & Ratings

One of the main reasons for buying a heavy-duty pickup near Goodyear and Buckeye is for its massive towing capacity. The GMC Sierra HD towing capacity is among the best in its class. With tech features like the available ProGrade® trailering system, up to 13 available camera views (including Transparent Trailer View), and the MultiPro™ Tailgate, it makes a strong case for being your go-to for commercial-grade hauling. If you are upgrading your current rig, you can get an Instant Cash Offer for your trade-in in minutes. Explore the towing specs for the 2026 Sierra HD lineup below:

Sierra 2500 HD Towing Specs

• Crew Cab (Pro, SLE, SLT): Max Conventional: 20,000 lbs | Max Gooseneck: 21,870 lbs
• Double Cab (Pro, SLE, SLT): Max Conventional: 17,900 lbs | Max Gooseneck: 18,600 lbs
• Regular Cab (Pro, SLE, SLT): Max Conventional: 14,500 lbs | Max Gooseneck: 22,390 lbs
• AT4 & AT4X: Max Conventional: 20,000 lbs | Max Payload: 3,524 lbs
• Denali & Denali Ultimate: Max Conventional: 20,000 lbs | Max GCWR: 30,000 lbs

Sierra 3500 HD Towing Specs

• Crew Cab (Pro, SLE, SLT): Max Conventional: 20,000 lbs | Max Gooseneck: 31,440 lbs
• Double Cab (Pro, SLE, SLT): Max Conventional: 20,000 lbs | Max Gooseneck: 31,580 lbs
• Regular Cab (Pro, SLE, SLT): Max Conventional: 20,000 lbs | Max Gooseneck: 36,000 lbs
• AT4: Max Conventional: 20,000 lbs | Max Payload: 4,127 lbs

Find Your GMC Sierra HD Work Truck At Liberty GMC, Inc.

Ready to get behind the wheel of your next pickup truck? Check our new vehicle specials for the latest offers, then give us a call at (602) 714-3106 to schedule a test-drive. You can also get pre-qualified online to save time during your visit. Stop by our showroom at your convenience for a tour of our new inventory. Our team at Liberty GMC, Inc. is dedicated to helping you find the perfect GMC Sierra 2500 HD or 3500 HD that fits your Arizona lifestyle and workload!