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Author Topic: Earliest 3969341 and Latest 3894860 axles  (Read 5838 times)
bcmiller
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« on: January 08, 2013, 10:48:08 PM »

It appears that 12 bolt rear axles with casting number 3969341 started showing up in 69 Camaros sometime around early August of 1969.  Prior to this, only the 3894860 casting number was used.  

What I am looking for are dates (casting date of housing and assembly date stamp - with letter codes - on the axle tube) for early 3969341 axles and late 3894860 axles.  If you know it is original to the car, you can post the body assembly date from the cowl tag too.

Please let me know what you have.  Post pics if possible.  There was probably somewhat of an overlap, but not sure how much.    

Thanks in advance!

Bryon

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Bryon
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« Reply #1 on: January 12, 2013, 02:30:37 AM »

Where are the casting numbers?
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« Reply #2 on: January 12, 2013, 12:08:22 PM »

Here you go.

Ed

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Ed Bertrand
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bcmiller
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« Reply #3 on: January 12, 2013, 06:33:47 PM »

09A Dusk Blue Z28 124379N680789
12-bolt 3:73 Posi:
assembly stamp C BU 0828
                           E
Casting # 3969341
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« Reply #4 on: January 13, 2013, 09:06:11 PM »

I parted out 9N677954  CBS0805G  341, cast G259. I only know of 2 341's before that one. There have to be more.....

Not a lot of axle casting data on these late cars in the db.
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Kurt S
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« Reply #5 on: January 14, 2013, 12:22:18 AM »

My 09C Z28/RS has the 3969341 rear, stamped BU0828

Gary
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
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« Reply #6 on: January 14, 2013, 02:09:30 AM »

Here you go.

Ed
Oh. Thought he was talking about the axles themselves! Duh!!!

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67 rs/ss 350 butternut yellow 4 speed 2nd owner
70 Z28 forrest green, green int, M40, bk vinyl roof PROJECT
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« Reply #7 on: January 18, 2013, 11:11:27 PM »

Maybe a little earlier than you want, but here goes:
06A
9N665238
BM0625G
Cast 860

Dennis
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Dennis
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bcmiller
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« Reply #8 on: February 09, 2013, 01:33:47 AM »

Keep the information flowing guys. Thanks for the replies so far!
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« Reply #9 on: February 10, 2013, 03:20:45 PM »

Build date 08E (Z28)
Casting number 3969341
Assembly stamp CBU 0828 G2
Casting date H139
                           
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Sonny

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« Reply #10 on: February 12, 2013, 06:19:45 PM »

My 09C Z28/RS has the 3969341 rear, stamped BU0828

Gary

Gary, is it stamped BU or CBU?  The one Kurt posted had a casting date earlier than yours and it used the 3 letter code. 

I am just trying to see if maybe the casting date change corresponded with the change from 2 letter codes to 3 letter codes.
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« Reply #11 on: February 12, 2013, 06:20:42 PM »

Build date 08E (Z28)
Casting number 3969341
Assembly stamp CBU 0828 G2
Casting date H139

Thanks! 
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« Reply #12 on: February 12, 2013, 11:48:37 PM »

My 09C Z28/RS has the 3969341 rear, stamped BU0828

Gary

Gary, is it stamped BU or CBU?  The one Kurt posted had a casting date earlier than yours and it used the 3 letter code.  

I am just trying to see if maybe the casting date change corresponded with the change from 2 letter codes to 3 letter codes.

only 'BU'...  2 letter code..   (see photo attached)
and actually I see that I posted the incorrect date...   BU0829G1 ....
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« Reply #13 on: February 15, 2013, 01:06:05 AM »

That looks like a C to the left of the BU. Pretty hard to see...
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Kurt S
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« Reply #14 on: February 15, 2013, 08:46:37 AM »

..  then you have better eyes or a better imagination than I, Kurt..  Smiley
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??
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69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
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« Reply #15 on: February 15, 2013, 07:35:25 PM »

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.
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« Reply #16 on: February 16, 2013, 10:47:36 AM »

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

K 88 dated 860 casting with BI1115G1 assembly.
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« Reply #17 on: February 17, 2013, 11:29:50 AM »

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....


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Sonny

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« Reply #18 on: February 17, 2013, 02:50:47 PM »

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.
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
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« Reply #19 on: February 19, 2013, 11:36:22 AM »

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.
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Kurt S
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« Reply #20 on: February 19, 2013, 10:00:30 PM »

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.
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Bryon
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« Reply #21 on: February 20, 2013, 09:11:23 AM »

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.
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
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bcmiller
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« Reply #22 on: February 21, 2013, 02:15:32 PM »

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.
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« Reply #23 on: March 27, 2013, 12:20:28 PM »

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.
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« Reply #24 on: September 23, 2013, 02:06:28 PM »

Saw this one yesterday but did not get a picture.  Was in a 70 Camaro at one time so perches had been moved.  Was either in a 70 Nova or 69 Camaro originally from what I could tell.
Casting number  3894860
Casting date      F 24 9
Stamped code   C BM 0807G1

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Bryon
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« Reply #25 on: January 29, 2014, 07:14:48 PM »

I wish I had better pics for you, but my rear end isn't there yet...

Casting Number 3969341
Casting Date H 11 9
Stamped Code C BS 0820G2





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bcmiller
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« Reply #26 on: January 29, 2014, 09:57:26 PM »

Thanks for posting the pics!
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« Reply #27 on: January 30, 2014, 02:59:13 AM »

sorry just noticed this thread
Here is a pic of mine from a 08C ( August of 69) car.
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« Reply #28 on: January 30, 2014, 11:57:15 AM »

sorry just noticed this thread
Here is a pic of mine from a 08C ( August of 69) car.
That's interesting. Five days between your rear end and mine and yours isn't a "C" rear end. Gary's is 9 days after mine and it isn't a "C" rear end either.
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Hawk
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« Reply #29 on: January 30, 2014, 12:14:09 PM »

Nope..   Gary's IS a C rear end..  although the C is partially obscured by an 'impact' wtih a rock or something in the past..?
(Bryan and Kurt finally convinced me there was a 'C' out there in front of the BU..)

see image here..     http://www.camaros.org/forum/index.php?action=dlattach;topic=10375.0;attach=10540;image
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Gary W.  /  69Z28-RS, 72 B 720 cowl console rosewood all tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe (2), 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55 Nomad, '57 Nomad, '57 B/A Sedan
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« Reply #30 on: January 30, 2014, 03:11:07 PM »

Nope..   Gary's IS a C rear end..  although the C is partially obscured by an 'impact' wtih a rock or something in the past..?
(Bryan and Kurt finally convinced me there was a 'C' out there in front of the BU..)

see image here..     http://www.camaros.org/forum/index.php?action=dlattach;topic=10375.0;attach=10540;image
Gotcha. I think I can barely see it now. That makes sense.
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Hawk
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