The 91.5 to 93 diesel 518/46RH was non lock up. You can convert them but it's not a simple bolt together deal. The lock up converter is thicker than the non lock up so you will need the 2nd gen diesel engine to trans adapter plate and starter. You may have to modify the frame rail to get the starter to fit. In addition the cross member has to be moved back 1.125 inches as well as shortening the driveshaft. Shift linkage and cooler lines also must move the same amount. Here is a link to my thread on converting the trans to a lockup. Lock up conversion thread
"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.
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