Ok im in on this now. Picked up an 02 2500 rear to go into my 95 2500 7.4 4wd.
A couple months ago I removed tossed and bypassed the inop abs unit because it was causing the front brakes to drag. I pulled the vac booster and installed a 95 3500 hydroboost and master cyl, and plumbed in an adjustable rear brake prop valve.
Modified the brake pedal, took an inch out of it between the pivot and the pin that the booster rod goes to and welded back together. That was fun, removed the whole dash to get the brake pedal out. Actually cut a small piece out of the underdash steel structure to get the pivot bolt out.
The brakes were a thousand times better at that point but now im doing the gmt800 rear end swap and going to track down the front gmt800 spindles and do the big front brakes also.