Not true, the 91.5-93 auto, O/D is a non lockup 46RH derivitive. Lockups started before the overdrives, The first overdrives came out in 89 and where optional. Regardless the OP want's to "morph" a 727 and a overdrive to use in a diesel. You would have to cut the back of the transmission and weld on a section from a od trans to bolt the od unit to it. Then you have the output shaft to deal with and how are you going to activate the od?(it's electric over hydraulic) Then hope you have everything aligned perfectly. More work than just finding a od that will bolt to a diesel. Lockup converters only available on gas versions before 94. 91.5 - 93 diesel O/Ds were all non lockup. O/D (as well as L/U before 96) were solenoid controlled by the PCM which just grounded the solenoid(s) so simple toggle switches would work. I'm not even going to address welding the rear of a 518/46RH case to a 727. Could possibly be done but not worth the effort and the cooler/lube circuit ports are bigger on the diesel even over the gas 46RH which are larger than 727. The back of those transmissions are more dissimilar than they outwardly appear.
"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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