When I looked many years ago all the crane hydraulic rollers for small block Mopars had iron gears. I can't speak to what they did on big block Mopars.

73 Challenger 340(416),E-heads, 727, 3.23 SG
2015 Challenger R/T classic B5, wife's car
2010 Ram 3500 Crew Cab SLT dually 4X4
2016 Challenger Hellcat Redline Red A8