Then the pan at least, for sure must be a '66 model year built in December of '65. Because anything built in December of '66 had to be a '67 Model year which would have contained the year in the stamp. The TH-400 in '66 and '67 had the assembly "DAY" of the "MODEL" year stamped. 372 of '67 meant 372 days from January 1 of 1966. Or January 7, 1967. So now how do I find info on the actual transmission to find out if it is a '65, '66, or '67? The stamp for '65 and '66 were the same formula but had NO model year, or assembly year. Characteristics in the case would be the only way to identify it as far as I can tell. Anyone??