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Well it came in my car when I bought it and the guy said it was out of a '69 mach 1. I've never herd of a C9 transmission, but a friend of a friend said that it was a rare racing transmission. I'm not sure how to tell what kind it is by the numbers, but maybe one of ya'll can. here are all the numbers I could find on it.</P>
C9ZP 7006A2</P>
9022 (These were on the other side in smaller numbers).</P>
RF C8-AP 7A:05A (those are on the front of the transmission).</P>
C9 means 1969 the rest of the numbers are a part number. I never heard of a C9 tranny either C4 was the standard small block auto but there is a small block C6.</P>