The A-833 was released for the 1964 production year. However, it had been in the works for some time. An important thing to keep in mind is that not every case has a clear casting date present on it. After handling thousands of these transmissions, it is evident that the greatest care was not...
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You will need to provide a pic too for full identification
Don't necessarily trust the case number for ID.
After all these years, worn/broken cases get changed, I have replaced several thru the decades, with whatever was under my bench.
You need to take the side cover off, and identify the gears by their markings listed below.
Season's Best, cheers .