[Mike C]

I have the same setup in my Jimmy. I swapped my 12 bolt parking brake cables into the semi-float 14 bolt backing plates with the 13" brakes. The rest of the parts were from the Suburban, and 86 in my case.

On the front I kept the 1/2 ton calipers and I kept the 1/2 ton master cylinder. The 3/4 ton master swaps reservoirs front to rear compared to the 1/2 ton setup.

My brakes work awesome with it setup that way. In fact, we are doing the exact same swap into my son's 72 Jimmy we are building using a donor 84 sub.