If you are happy with the current braking, and see no need for additional power, then stick with what you got. However, if you are like the 99. 99% of the rest of us who would always like more whoa power, then go for the 12x3 and 1 to 1-1/8" wheel cylinders. Some say the 1 inch wheel cylinders actually give more bite and stopping power.
Stock was normally 12x2-1/2 for the 3/4tons.
Daniel