12-Bolt Axle numbers stamping inquiry

[rpoz11]

pic add.....
The axle tubes are bell reduced at the flanges for the backing plates of the drum brakes. They are not straight...

[Lynn]

Do you know what car the rear was in originally? If not, what is the history?

Unless I missed something here, it appears it is from a late 69 COPO Camaro.

Obviously assembled Oct 30. What is the casting date and casting #?

Lynn

[rpoz11]

it is difficult to read!
To me, I was thinking that this is too late for 69; was thinking Oct/Nov 1968...

[Lynn]

99% certain the "C" designation did not come along until Aug of 69. However, if you can get the casting date, that will probably solve the question of which year.


Remember, in Aug of 69 Chevy was making 70 model Novas and still making 69 Camaros. That's why the late Camaros are often referred to as 69 1/2 models. Starting first week of Aug. 69, they had to comply with federal standards for 70 models even though titled as 69's. That's why most of the 08A and later Camaros had the mylar VIN sticker in the driver's door jamb. My car was evidently one of the last NOT to get the sticker. I know the car that was 86 cars later did get one. Both cars are 08A.

Anyway, the Novas and Camaros still received the same rear axle assemblies up until sometime in November 69. I had an October built DZ motor. I think CRG has some figures on the apprximate date for the last 69 to roll off the line. At any rate, there is no doubt that 69's were still being assembled in November, so that rear could have gone in a very late 69 COPO.

Try and get casting date and casting number. I am especially interested in the casting number for personal reasons.

Sorry this is so long.

Lynn

[Kurt S]

It's a late 69 unit. Probably a 3969341 casting. Got one sitting here (lowly CBS code though).

The 70 Nova codes were generally the same as the 69 codes except with a C in front of the code.
First week of Nov is the last week of 69 Camaro production. See my comment above.

[enio45]

Attached is set of codes from my 69Z - Build date 4th week oct of 69. It has a70 axle.

REAR AXLE
-Housing Date Code 0 BU 1016G2
E

3:73, Oct 16, Gear&Axle Plant, U or 2(shift)

0 – believed to be 70 rear used for 69 late production
-Housing Casting Date J79
12345
67890 Oct 7, 69

- Housing Casting Number 3969341NF GM64

[rpoz11]

On axle casting dates in late 1969 on 12-bolts, did GM use "I" or did they skip the I ; ie: I-15-9 ???

[rpoz11]

Kurt, did you you have any input on the code on my axle??? Have you ever seen this on any others ??? Thanx!

[Mr70]

They did use the letter "I" in the rear casting date.September 15, 1969.
Delco was the Manufacturer that is well known for skipping the letter "I" when dating electrical components.

[SamLBInj]

[ QUOTE ]
They did use the letter "I" in the rear casting date.September 15, 1969.
Delco was the Manufacturer that is well known for skipping the letter "I" when dating electrical components.

[/ QUOTE ]
I asked Art Schwarzell about that years ago and he said ":I dunno, I Forget"