12-Bolt Axle numbers stamping inquiry

[rpoz11]

On my 12-bolt, I have C XX 1030 G1
---------------------------->E<---------------------------

What does the "E" designate? The "E" is right under the 3 of the 1030
Thanx!
http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[Mr. T]

E = Eaton

[rpoz11]

What is the Eaton reference indicating???
I just never paid attention to this before....Thanx!
http://www.yenko.net/ubbthreads/images/graemlins/beers.gif http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[Mr. T]

E is a positraction code. E refers to Eaton positraction differential.

[rpoz11]

Ahhhhhhhhhh That explains that! Ok, Now I know. Thanx! The "C" is for ????
http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[WILMASBOYL78]

"C" is the first of three letters that designate the axle ratio code that applies to a specific model and year. The three letter code started witht the 70 model year. EG: CBT = 1970 Nova 3.55 posi. Colvin's book has a complete listing of the codes.

wilma

[rpoz11]

Mine has the C then the two digit code for a 69 Camaro
So the C here is for?

[Mr. T]

What are the two letters after the C?

[rpoz11]

sent you a PM http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[rpoz11]

Sorry, the PM came back to me for some reason; I re-sent it to you... http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[rpoz11]

PM's expired for you to receive, at least that is what I was given and could not continue.
Guess we will have to wait until tomorrow so I can email my Images for you.

[Mr. T]

Ok, give it a shot now.

[Kurt S]

It must be a late 69 axle when they started using the 70 format. C = Car.

[YENKO DEUCE REGISTRY]

I believe the 'C' was stamped separately from the other letters, sort off to the left and crooked?

[rpoz11]

The "C" actually is not that close to the 2-digit suffix. It appears more correctly as this:

C.....XX...1030..G1
----------->E<---------------------

[Mr70]

As Kurt stated,it's a late 1969 production rearend.
The assembly date of 10/30 is most likely 69.Check the Housing cast date as well to confirm.They made the 69 Camaro's much later then usual.
Chevrolet instituted the letter "C" in 1970,with their drive train components to help identify their applications better.
"C" stands for Passenger Car.
"T" stands for Truck.

[rpoz11]

Mr70: Did the Duece Nova or any 1969 COPO Nova ever receive a BE rear axle? http://www.yenko.net/ubbthreads/images/graemlins/confused.gif

[Mr70]

I'd say no on both counts,but others here may have more experience with them.
I see the BE 4:10 posi was specifically a 1969 Camaro application.
BV was the 1969 Nova 4:10 posi application.

[Chevy454]

If I'm not mistaken, "BV" was also the *normal* 4.10 in the Camaro, as the Nova/Camaro units are identical...the "BE" was the COPO 4.10 unit...

[rpoz11]

Ok, so if Don Yenko , for example, ordered lets say 20 Novas under the COPO order with 427s in late 1968 for it to be a 1969 , what axle would it get? http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

[rpoz11]

Could Ed Cuneen possibly chime in on this? http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[YENKO DEUCE REGISTRY]

The '69 Novas were not COPO's, so they did not get the COPO 'BE' version of the 4.10 rear - they received the standard 'BV' 4.10 version.

The '70 Novas were indeed COPO's, and received a uniquely coded rear - 'CBW'. However, according to our research, the 'CBW' rear doesn't appear to be all that different from the prior year's 'BV' rear - ie; no special plates, springs, or clutch packs. We believe that the 'CBW' code installed under the COPO was necessary because 4.10 rears were special order only in '70, and the 3.55 was the lowest ratio under RPO's. We are still researching this though.

[rpoz11]

Ok, with that I accept but would the Nova axle have a different casting # center section vs. the 12-Bolt center sections used in 69 Camaros or the BE axle?

[YENKO DEUCE REGISTRY]

No, same casting number, only the carrier assy was different due to the different posi components, and axle assy was different for the hardened shafts.

[rpoz11]

Can we talk via PM ? http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[rpoz11]

Ok, as we understand COPO cars, the blocks and Heads are understood unless otherwise doc'd. Muncies as supplied via GM as they were given, Intakes, carbs, water pumps, etc..etc...etc....
Have we ever done a full documentary on all BE's in every known existing car on the lists???
Is there any discrepancies on the BE at all throughout the build assmebly that would show anything unusual????
So many things occured back then, variations, etc between many RPO's;
Could there be any variances to the BE whatsoever?
http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[Kurt S]

If that's a CBE1030 axle, I'd guess that it's a service part. Could be from a last week of 69 car, but it would be pushing it vs observed data.

Not sure what your question is in your last post.

[rpoz11]

Ok...Thanx for your input! http://www.yenko.net/ubbthreads/images/graemlins/beers.gif
I have found this table, with these axle codes added:
(all were for the NOVA application of 1970)
CPO-"Heavy Duty"; change COC to CBQ; new codes CBI, CPL, CPM, CPT, CPU
************************************************** **********
The chart attatched provides what codes are known...

The Camaro codes seems to be in the COA-COZ & CRA-CRY order, so if you suggest a CBE, this would be...?

[rpoz11]

Here is what I have.... http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[rpoz11]

[ QUOTE ]
The '69 Novas were not COPO's, so they did not get the COPO 'BE' version of the 4.10 rear - they received the standard 'BV' 4.10 version.

The '70 Novas were indeed COPO's, and received a uniquely coded rear - 'CBW'. However, according to our research, the 'CBW' rear doesn't appear to be all that different from the prior year's 'BV' rear - ie; no special plates, springs, or clutch packs. We believe that the 'CBW' code installed under the COPO was necessary because 4.10 rears were special order only in '70, and the 3.55 was the lowest ratio under RPO's. We are still researching this though.

[/ QUOTE ]
So, As I approach the list I provided, with added updates, and as I read the quote here above, the 4:10.1 was not on the list and should be a special order? http://www.yenko.net/ubbthreads/images/graemlins/confused.gif

[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! http://www.yenko.net/ubbthreads/images/graemlins/frown.gif
To me, I was thinking that this is too late for 69; was thinking Oct/Nov 1968... http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

[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). http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

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. http://www.yenko.net/ubbthreads/images/graemlins/wink.gif

[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 ??? http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[rpoz11]

Kurt, did you you have any input on the code on my axle??? Have you ever seen this on any others ??? Thanx! http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

[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" http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[Kurt S]

I haven't seen any BE axles that late.

[rpoz11]

Well, I guess here it is.... http://www.yenko.net/ubbthreads/images/graemlins/beers.gif