Axle Code

[-DA]

http://www.camaros.org/drivetrain.shtml#AxleCodes

dig through that link for more than just the spreadsheet of axle codes. it seems the BP code was used for 3.08 open diff 10-bolts in '67, not just as 2.73's in '68-9. like David Pozzi said the date codes is cast on the center section... that link will show you everywhere to look and how to decode it as well.

-Dave