While searching the site, I found a link to a disc brake conversion kit for the 1955-1959 3/4 ton trucks. I also read on this site the 1953 and 1954 3600s use the same steering knuckles as the 1955-1959 trucks. I emailed the seller and asked if his kit would work on my 1953 3600. He replied: "This will work on a 53. You will have to drill out the holes on the spindle from 7/16-1/2 inch."
Does anyone have any experience with this kit? It appears to use REAR rotors from a 2000-2006 Chevy 2500 and calipers from a 1976- 1986 K20.
https://www.ebay.com/itm/1955-1956-1957-1958-1959-Chevrolet-Truck-8-lug-front-disc-brake-conversion/350973126802?hash=item51b7a0e892:g:GDgAAOSw~QRZ~4WB