[Chevelle-list] Identifing a posi unit

[William Piper]

All
 
I did some horse trading awhile back and end up with this GM 12 posi
unit.  It looks to be a 3 series carrier with a spacer with a 4.56 ring
and pinion. The number stamped on the ring gear is 1  GM  3862527 9 41 4
67. Can anyone confirm this? I'm making the assumption that 4 67 is the
manufacturing date.
 
The cast numbers on the carrier are-  EDB-30140  2    and a 301 at the
bottom.  See attached pictures.  Any help would be appreciated.  Tom