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HELLO MY NAME IS TOM FOWLER AND I HAVE A 1949 PACKARD.
I NEED TO KNOW THE DIFFERENCE BETWEEN A R-9 AND A
R-11 TRANSMISSION.

ALSO I NEED TO OBTAIN ELECTRIC SOLENOID AND OTHER PARTS
FOR AN ELECTRICAL OVERDRIVE.

R9 4wires on solenoid. R11 2 wires on solenoid.

Mechanically and electrically, quite different. For a mechanical description of the R11 download this tech articlehttps://www.packardinfo.com/xoops/html/downloads/SC/SC-VOL23NO2.pdf For a complete rundown of the R9 it is detailed in a training manualhttps://www.packardinfo.com/xoops/html/downloads/EconoDriveTrainingBook.pdf

Externally, the easiest way to tell without crawling under is R9 has a 6 wire black box relay on the firewall about the size of the regulator and solenoid and lockout cable is on the right or passenger side. The R11 has a 4 pole usually a natural metal color relay with a fuse on the side. It's about half the size of the regulator and it's solenoid and lockout cable is on the left or drivers side.

The Packard vendors Kanter, Max Merritt, and perhaps Patrician Industries and a couple of others will have most of the items. The R11 was used in more make of cars so parts are a little more plentiful and several multi make vendors can help on those.

G'day Tom, or is that FRED?
to PackardInfo and for posting your query. I see you already have answers which will help with the identification required. Another thing, and I know Howard has tried to save you from crawling under the car, is that R9's have that cast into the OD housing and I presume R11's would be similar so a visual inspection of the OD unit may help too.

Finally, I invite you to include your '49 Packard in the Packard Owner's Registry here on PackardInfo!