Trying to figure out what this is it came out of my 64 barracuda 318 4 speed

Brooks James said

I remember a discussion here about the 3.09 first gear, if the 2nd gear is near the same as anA833
Aluminum With OD, the rpm will drop significantly

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Second gear in the OD trans is 1.67. Second gear in the non-OD 4-speed with the 3.09 gear is 1.92.

Not nearly so much rpm drop from first to second in the non-OD 3.09 trans as in the OD trans.