It appears that 12 bolt rear axles with casting number 3969341 started showing up in 69 Camaros sometime around early August of 1969. Prior to this, only the 3894860 casting number was used.
What I am looking for are dates (casting date of housing and assembly date stamp - with letter codes - on the axle tube) for early 3969341 axles and late 3894860 axles. If you know it is original to the car, you can post the body assembly date from the cowl tag too.
Please let me know what you have. Post pics if possible. There was probably somewhat of an overlap, but not sure how much.
Thanks in advance!