Welcome to the forum and to Packards. The 21st series 46-7 cars are excellent cars for the first foray into Packards.
The OD is Borg-Warner and would have been the R9 in 46-47 cars. Packard never used the R10 and went to the R11 in mid 48 after 22nd series production had commenced. The 356 engine cars had a heaver duty version of the R9 designated the R9A-1. That has a slightly larger input shaft and a pinion assy with 4 pinions vs 3 in the other cars.
Your Super should have the big engine (356) if it is the original engine. The trans and OD assy needs to be the heavy version for the input shaft to fit the clutch, throwout, and pilot bearing etc. You might want to verify the combination you have. In addition to the OD, you will need the R9 dual relay assy and R9 solenoid. Neither of those is interchangeable with R11 components and if not present can be expensive. Used are getting harder to find in good condition. The R9 kickdown switch is different but the R11 switch can be used. The other items such as lockout switch and cable, governor etc are the same as R11s used. Mechanically and electrically the R9 is quite different than R11s. They can be a bit more temperamental if electrical items are not working properly.
You can download the EconoDrive training manual from the literature section on site
https://www.packardinfo.com/xoops/html/downloads/EconoDriveTrainingBook.pdf That is the Packard manual detailing the theory, operation and repair of the R9.
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