I'm doing some VIN research to determine the build date of a car I'm considering. I went to the archives ( here ) and got the "Ending VIN #" for the previous month,
then added the daily production rate ( per production day ) to work my way up to the VIN I'm researching. Using the previously agreed to figure of 912 cars per day,
I come up with a build date that is two weeks later than the build date on the trim tag.
Is this possible?
A couple issues need to be clarified:
1) If a build month ends on a Wednesday ( let's say April 30th, 1969 for this example ), that would be a 04E build date. The following month starts on the next day,
Thursday in this example. Would Thursday & Friday count as 05A? What if there was only one day ( Friday ) left in the week that starts the new month? Does
Friday count as 05A?
2) How accurate are the "Ending VIN" numbers GM supplied ( listed here )?
I had done a similar VIN research on my current SS and it worked out to late 10D, or possibly very early 10E - so my 10D trim tage code is very close. As I mentioned
earlier, the potential car is off by two weeks ( later than the code on the trim tag ).
Am I missing something here?
Or, is this within the acceptable tolerance for VIN research?