[Steve Shauger]

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P9P10 Muncie build decodes as...

P---Muncie assembly plant
9---1969 model year
P---Sept.
10--10th day of Sept.
This is an early build trans, Sept. 10th of 1968 for use in a 1969 model year car...
It has no A-B-C ratio designator because that didn't start until the end of Sept. 1968 calendar year, a little more than a month later... Hope this helps... Crash

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I have a Muncie with build date P9R03B, this one is Oct 69 based on the VIN derivative.

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I would bet that the trans came out of a 69 camaro, since production was extended until Nov of 1969. Again camaros built in this time frame were still considered 1969 model year camaros. The VIN is what identifies the year in which it was built. The Vin most likely starts with 69xxxx or 70xxxx.