ring and pinion date code

[janobyte]

Where are the date codes located ? End of the part number ? eg: 2 68 ? 

[ZLP955]

Not sure on pinions, but the ring gear usually has part number, ratio (xx yy), and date code (m/mm, yy).
Here's an example from chevellestuff.net:

[janobyte]

mine are coming out (ring gear)    10  41 2 68 ,I know they are the gears the car shipped with ,just trying to break the code, assuming should coincide with rear end housing build date.

pinion stampings are pronounced  I see  what can be interpreted as 4:10 and 68, not sure of the month and digit order as it relates to.

Pretty cool ,still have the box the 4:88's came in 69 (Milad's) when #2 owner ordered them...4:10's have been in it ever since.

[bcmiller]

mine are coming out (ring gear)    10  41 2 68 ,I know they are the gears the car shipped with ,just trying to break the code, assuming should coincide with rear end housing build date.

pinion stampings are pronounced  I see  what can be interpreted as 4:10 and 68, not sure of the month and digit order as it relates to.

Pretty cool ,still have the box the 4:88's came in 69 (Milad's) when #2 owner ordered them...4:10's have been in it ever since.

Your ring gear is dated February of 1968.  

On pinions, sometimes the month is a bit off from the year.  See this attached example.  1 69 on this one.

[janobyte]

thanks

[bcmiller]

And here is another pinion that was paired with a 3 of 69 ring gear.  Honestly I am not sure if this pinion is dated 2 of 69 or 4 of 69.

Dates on the ring gear are normally very easy to determine.