Question for you Barry and Co.
I have a St. Louis built roadrunner convertible with a SPD of 4/16. It does not have its original motor but I am assuming the trans that came with the car is (it is missing its VIN stamp). The information I have been able to come up with which give some clues as to when it was built:

Axle housing assy dated 4/23/69
8 ¾ sure grip assy dated 4/22/69
3:23 ring gear dated 4/19/69
3:23 Pinion gear dated 4/16/69
Trans assy date 2818 4/15/69
SPD of car 4/16/69

I estimate (SWAG) build date of car between Thurs 4/24 and Wed 4/30 1969 What do you think?

Also;
Do you know if this kind of shift in production could have affected whether or not my trans was stamped with its VIN? I am assuming the trans I got with the car is correct and it's assy indicates that is a good possibility. Anyway, here is a picture of the trans. ID pad.