Earliest 3969341 and Latest 3894860 axles

[paceme]

Gary my car is a 9A and is coded C  BU date is 82X I believe either a 6 or 8. I think the exhaust system had rubbed against the tube and now the last digit is hard to identify.

[mickeystoys69RSSS]

No help in answering your question because my 69 is an early build 11C '68.

K 88 dated 860 casting with BI1115G1 assembly.

[restore-z28]

Do you have a photo of a CBU stamp?  I don't think I've ever seen one, so maybe it's not like I was expecting..?
or maybe Bryon can post a pix of his as he has a C BU code??

Here you go Gary....

[69Z28-RS]

Thanks for the photo Sonny.  It's interesting to see how much separation there is in the 'C' and the 'BU'.   Does anyone have any idea why the separation?  stamped separately?  or ??  if so, maybe the 'C' is carrying some other piece of information we aren't aware of?
and seeing the separation, perhaps Kurt was correct, and there 'was' a 'C' before my BU code, but if so, it was apparetly hit by a highway rock, or debris, and became obscured to the point it is no longer clear.

[KurtS]

I think the axle stamp didn't have a place for the extra C character. Not sure how they handled it, but the letters are spaced like that.

[bcmiller]

I agree with Kurt, I think it is C BU.

I am starting to think more that the 3 letter code started when the casting number changed to 3969341.  But more data points are needed.

[69Z28-RS]

I went back to the CRG data on differentials, and it says the 3 letter code began wtih the '70 model year, and the 'C' represented 'cars' (I supposed as opposed to truck differentials?)..  Given that, it makes sense that at the time they would have normally began building the new model year (late July or August or so?), they would have began using the new parts; as they did for a number of different items on our late '69 cars; several items are labeled as, or carry characteristics of the '70 model year, rather than the '69 model year.

[bcmiller]

The space between the C and the other two letters of the code is there for most (I am not quite sure I can say all) cases that I have seen for late 69 Model year and early 1970 model year Camaros.  It is not always there for Chevelles. 

Attached is a 1970 C OZ code that shows similar spacing.

[bcmiller]

The attached image is from an Impala.  Casting number is 3969341 with casting date I 5 9.  Just for additional reference.  It has the C before the FW.