The 47RH was a two year only deal, 94-95. You can however convert a 91.5-93 non lockup diesel 518/46RH to lockup with the correct input shaft, reaction shaft (or support) and the lockup valve body. Here is my write up on another site.
Turn a non lockup into a lockup


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.