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Is this typical of a mustang C6 transmission vin stamping, 9R*131845 also this trans has a G servo. This C6 was in my 68 mustang when I purchased it in San Francisco. Seems to be from a 69 and not my car.
I am not sure if this explanation is right for your car but it is for many. It was typical for transmission shops back in the day to treat a transmission case as just a generic core. -
If it was the original from your car it would match your car's serial number except the body code and engine codes are omitted. Same as the VIN stamp on the engine.