Nah, the Chevy rear brake cylinders are a way common thing / upgrade for the second gen dodge guys. I've had them on the back of my truck for years now, as have many others, without issue.the Chevy might have bigger shoes and thicker drums. You could wreck the shoes, and warp the drums with the extra pressure maybe? Like compounding your brakes on a Semi truck.
There is a wheel speed (well, actually ring gear speed to be exact) sensor mounted on the center of the differential that inputs in the rear wheel speed to the abs module.There are no wheel speed sensors. I don’t know what that stuff is but it works. I slammed on my brakes in gravel, and loose gravel on pavement. The slightest little chirp and I’m stopped immediately.
It probably doesn't really matter either way. Looks like its been working as-is for awhile now and those brackets aren't really supporting any load, just keeping the lower airbag mount from sliding off the top of the leaf spring.The mounts are correct.
Edit; I looked at the top, not the bottom. My mounts have U-bolts that go under the leaf so you might be correct.
Cost and general PIA aside , the parking brake on the disc brake Dana 80 in my drw f350 worked pretty good. Same for the disc Sterling axles in the f250 and excursion.Tell us how much you like the discs after buying all that stuff, plus a different proportioning valve, and attempting to make the park brake to work.