Survivor? original? Or numbers matching?

Why does this keep coming up lately? Seen it in several threads.

The rear axles are NOT stamped with a VIN on these cars. 8 3/4's aren't stamped with anything. There were some factory paint markings depending on the year, but nothing was stamped or cast into the housing. They did move the axle breathers depending on the year of some of them, but that's as close as you're going to get other than going off the dimensions (assuming they're stock).

Here's a list and examples of the markings the 8 3/4's got.

http://board.moparts.org/ubbthreads/showflat.php?Board=A12&Number=5908673&Searchpage=1&Main=5907050&Words=&topic=&Search=true

Dana 60's are stamped with a date code and a "bill of materials" or BoM number, that tells you how they were set up from the factory (gearing, limited slip, etc). But that had no relation to the vehicles VIN, and the VIN wasn't stamped on the Dana's either.

Dana 60 decoding
http://www.cuda-challenger.com/cc/index.php?topic=46240.0