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Help decoding a rear

1304 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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The 3917124 was used in late 67 as well as 1968 and early 1969. The ID code "CI" was used in all three years for a 3.73 Postraction so that's not much help. As suggested, look for a date casting in one of the webs like this:

You'll have a letter for the month (A...L for Jan...Dec) followed by a 1-or 2-digit day of the month followed by a 1-digit letter for the year. This example is June (F) 21, 1967.
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For rear ends, engine blocks, heads, etc. it's been letter/day/month for casting numbers and stamped IDs for blocks and rear ends it's been 2-digit month, 2-digit day since at least 64 I believe.

Some don't include the letter "I" and some do. There may be more parts, but the only thing that comes to mind off-hand with julian-type dates are on TH400's. :)
You're right, 71 & 72 rear axle housings were coded with julian dates. :thumbsup:
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