The 3/4 ton brakes are beefier/larger, but swapping them will require swapping the entire brake system. The master cylinder itself is the only common part. The rear brakes will require swapping the entire axle, fronts will require at least a spindle and bearing swap. The hard lines will also have to be changed out as 3/4 ton uses larger steel lines. You will also find that the rear gear ratio is not highway freindly at 4.56 (std) or 5.13 (opt). Plus the wheels and tires will have to swapped due to the different bolt pattern.
