I found what seems to be a disc break conversion kit at TSM mfg. They are for 8 lug 3/4 and 1 ton trucks. Has anyone used these? Seems like it comes with everything you need for the front end but not the rear. Which is what I was looking for. https://www.tsmmfg.net/chevy-gmc-8-lug-truck-complete-front-disc-brake-kit-1847.html