(3894859NF) Axle housing cast date vs. stamped date on tube, ...how far apart?

[KevinK]

 Just curious how far apart the cast date is/could be from the stamped date on the tube??
  (This is a 10-bolt rear from a 1968 Camaro, ... 3.08:1 posi )
  If I'm reading the cast date clearly, ...I believe it's " F 26 7 ", ...where the stamped date is " PE 0918 G1 ". 
   
    If I'm correct, ...that's June 26th '67 cast vs. Sept. 18th stamped. That's about a 2  1/2 month spread which seems like a lot to me, ...but maybe it's 'typical'?
 
     Related, ...these are the numbers off the ring gear: " 1 GM 3790629 12 37 9 67 ", ...which (9 67) seems to match the stamped date.
 
    
   Thanks in advance for any info,
 
    Kevin

[firstgenaddict]

end of model years always has an effect on when parts are cast vs assembled.

[KevinK]

end of model years always has an effect on when parts are cast vs assembled.

   
    ...true. But this is an early model year build '68,  with Sept/Oct '67 dated parts. I suppose the axle housing itself was 'left over' from '67, ...and not used until later in the year.