Unfortunately a disc brake upgrade kit isn't available for the 8 lug 3/4 ton. I have a 49' 3600 myself. I'm keeping the brakes stock as I will just be using mine for a summer fun driver and the drums will do just fine. You would have to come up with some 8 lug rotors that fit for a center hole, lug spacing/size, and depth clearance for the rim and the tie rod end, make your own brackets to bolt off the back side of the brake shield to hold the calipers. Then you need to add a master cylinder with a brake booster and proportioning valve. Another option would be to swap out the entire front axle for something more modern. Hopefully someone on here that has done that will chime in.
