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Help decoding a rear

1305 Views 13 Replies 5 Participants Last post by  Jim_66SS
Hi , Can someone help me with this rear code. I was told it was out of a 67 chevelle. Someone told me they think it is a 68-69 chevelle. I found the one that shows the ratio ( CI1219B ) Thanks in advance.

numbers CI 1219B

NF 3917124

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It would appear to be a 121st day of 69 rear. Have you checking the webbing for a foundry date?
Hopefully Dale will come back and possibly shed some light on the date stamps in the axle tubes. I originally thought it was a month / day / year thing....example the above mentioned CI 1219 B. But I did a little web search and found a reference on and seen it referenced as a 121 day of a year or as a julian date. Did this change for a certain model year as I believe in 67 they used the first mentioned example?
Thanks Dale I went back and re checked the web site. I was looking at the 71-72 rear axle tube examples and not 69 when they used a julian date type example?
James I to have read that before but have never compared. I believe that is why the say you will need to use the upper control arms to match the date of the rear.
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