You are correct. I made a mistake. I remembered something with the brakes being a manditory option. Disc brakes stuck in the brain. According to the order sheets, Heavy Duty drum brakes were part of the R/T package. If the optional performance axle package "Super Track Pac" (4:10 DANA) was ordered, then disc brakes were part of the package. You could get this package with the 440+6 or the Hemi engines only.