2025 Gmc Sierra 2500hd Payload Capacity V6. Gmc is unveiling the 2025 sierra heavy duty and the first ever 2025 sierra hd denali ultimate, redefining the power and capability of this dominating truck. The motortrend buyer's guide has the 2025 gmc sierra 2500hd specs you need, from dimensions and cargo space to power and mpgs.

There are only marginal changes from 2023. Find specs and features for the 2025 gmc sierra 2500hd including dimensions, horsepower, engine, capacity, fuel economy, transmission, safety rating, drivetrain and more.