2025 Duramax Specs. 2025 duramax diesel general motors announced a revised, more powerful version of the 6.6l duramax diesel for the updated 2025 model year gmc sierra and chevrolet silverado hd. Style, configuration, engine options * chevrolet silverado 2500hd zr2.

In terms of specs, the big changes are the peak power and torque figures, with the new 3.0l i6 lz0 turbodiesel duramax engine producing a maximum of 305 horsepower at 3,750 rpm and. Detailed specs and features for the 2025 chevrolet silverado 2500hd including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain.