3/4 Ton 250, 2500 payload limitations (gas vs diesel)

If you are talking payload, the rear of the truck doesn’t change that much in weight between a gasser and diesel. The difference is on the front axle between engine types. Because of the vehicle class weight limits, it makes it look like it is less capable.

Ford markets a F450 in the 350 class. It looks like it has less payload than the smaller F350, but one look at the stronger and heavier components will tell you otherwise.