AdThe GMC® Sierra Heavy Duty Offers Available Max Towing up to 36,000 LBS. Visit GMC.com. The 2025 Sierra HD Duramax 6.6L Turbo-Diesel V8 Engine with 975 LB-FT. of Torque & 470 HP.
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Models: Sierra HD 2500, Sierra HD 3500, Sierra HD Denali, Sierra HD Denali Ultimate
