Front fenders between GMC and Chevrolet are Different due to grill opening etc. The front box panel on a One ton has an extra stiffener spot welded in. The one ton bumpers are nearly twice as thick as 1/2 and 3/4 ton.
But you can do anything you want to with anything. One of my one tons has a Cummins Turbo Diesel, Power servo Disc Brakes, 727 Tourqueflite transmission,with the top of the SM 420 transmission sawed off for shifter,3.07 rear end, 20 inch Dually armored car wheels.
Just Do It...........
