The trans code is located on the right side of the fluid pan. My 67 has a code of T7S02D:
T - Toledo powerglide passenger car
7 - 1967 (model year)
S - November
02 - 2nd day of Nov
D - Day shift
Check this link from the Camaro Research Group:
http://www.camaros.org/numbers.shtml...missionNumbers