12 bolt posi carrier

[Lukes 69 z28]

I have a 12 bolt posi carrier that I would like decoded. By the bearing opposite the ring gear casting numbers EDB30174 then 260 or 280 . On the ring gear flange it has J-1-F The gears are dated 6-65  .Are any of these numbers on the carrier a date code or are they not dated thanks.

[bcmiller]

EDB30174 is a 4 series carrier for  3.90:1 & up gears.  I don't know what the 260 or 280 means.  Is there anything else on the ring gear like 41 10 which would be for 4.10 gears

[Lukes 69 z28]

Yes the gears have 41 10 . What Iam  trying to find out if carriers are dated for the model year like  the housing are . I was wondering if the 280 is the days of the year or the 28th day of 1970.