I spent about an hour searching, maybe my search skills are inadequate, but has any body done a rear disc conversion on a 40 using discs with a drum in them for the ebrake? I believe it would require going to 16" or 17" wheels but I don't know what else is involved. Neither of my trucks has provision for the tcase ebrake and the '83 has Monte Carlo rear discs and calipers, thus no ebrake.