Earliest 3969341 and Latest 3894860 axles

[bcmiller]

Note here from the Chevrolet Dealer Service Information Bulletin dated September 29, 1969.

The first C in the code designates it as a Passenger (car) type axle versus Truck. This is for very late 1969 model year axles and continued into 1970.  Things changed again in 1971. Remember that GM "Corporate" 10 bolt axles were gradually implemented in the early 1970s.

[GCS SS350]

Build Date : K208
Housing Stamp : BS1205G2
Num : 3894860NI

Early 1969 SS350
Vin : 124379N561885

Assume Diff, is orignal as matchs protecto Plate Numbers
Has 3.73 posatraction currently & have orignal 3.31 gm gears
If anything else naaded let me now

[bcmiller]

Build Date : K208
Housing Stamp : BS1205G2
Num : 3894860NI

Early 1969 SS350
Vin : 124379N561885

Assume Diff, is orignal as matchs protecto Plate Numbers
Has 3.73 posatraction currently & have orignal 3.31 gm gears
If anything else needed let me now

Thanks for your post and welcome to the site.

What we are looking for in this thread is data on cars built the summer of 1969.

I will send you a private message.

[bcmiller]

Had someone else send me some data, it is the last one on the list.  C BE 1030G1  - not peened.

This does remain an active topic. I may have a few more to add that were obtained the past few years.

[bcmiller]

Updated January 11, 2021

Remember when submitting data - put all of the information requested in ONE POST - PLEASE.

Some notations have been made for C BU axles where the C has been peened. I did not note this on all of the ones listed.

Here is what we have so far.  We need more data points for axle assembly dates between early June and early August.  My apologies if your data was inadvertently missed.

It appears that the 341 casting number started being used in June. It appears that the 3 letter code had started by early August, possibly earlier. 

Remember that there was a shutdown for the latter part of July and into very early August. 

01C
BM 0124G1
860, casting date A 21 9

06A - 9N665238
BM 0625G
860, casting date unknown

07A - 9N6687XX
BU 0630G2
860, casting date E 26 9

Unknown build date
BE 0708G1
860, casting date D 28 9

Unknown build date possible over the counter/warranty axle
C 107 231 G1 with 7 and 1 peened out, shows C 10 23 G1
341-A, Casting date E 14 9

08E  9N677954
C BS 0805G
341, casting date G 25 9

08C
C BL 0806G1
341, casting date G 23 9

Unknown build week and/or VIN
C BM 0807G1
860, casting date F 24 9

Unknown
No assembly stamp, possible warranty axle
341, casting date F 28 9

08D  9N6745xx
C BU 0818G2
unknown casting number or date

08D
C BS 0820G2
341, casting date H 11 9

08E, 9N677163
C BL 0812G2
341, casting date H 5 9

08E
C BU 0828G2
341, casting date H 13 9

08E
C BU 0828G2
341, unknown casting date

09A - 9N680789
C BU 0828   
341, unknown casting date

09A
C BU 0826 or 0828
unknown casting number or date

09C
C BU 0829G1
341, casting date G 31 9

Unknown build week and/or VIN
C BS 0829G1
341, casting date H 17 9

09C 9N684457
C BU 0829G1
341, unknown

09C   9N685397
C BU 0910G1
341, casting date I 2 9

Unknown build week and/or VIN
C BU 0916        C area is peened
341, casting date I 6 9

Unknown build week and/or VIN
C BU 0922G2    C area is peened
341, casting date I 11 9

10A
C BU 0929G1    C area is peened.
341,

Unknown build week and/or VIN
C BS 1028G1
341, casting date J 3 9

Unknown build week and/or VIN
C BE 1030G1 not peened
341, casting date J 3 9 or J 8 9 (hard to read)

Updated

[bcmiller]

If anyone can confirm if there is an NF or something else after their axle with a casting number ending in 341 I would appreciate it.

We have found a very early 341 casting that has a -A and might be a test casting.

[bcmiller]

Found one listed in a car today. CBU 0815G2 in 9N672588 but can guarantee it’s original.

[JST69Z28]

Attached is a photo of my differential date code on a 69 Z28, 07A car,  BU 0624G2 E.  On the diff, it also has 3894860NF, E189, and GM 57 numbers.  Reading through other posts it should have a C in front of the BU but I don't see one.  I'm new to the group and reading through history and adding info.  Hope this helps as you build data.  I really appreciate all of this great info.

[JST69Z28]

I forgot to add the VIN, 124379N665447.

[BULLITT65]

The "C" stamp seems to be as early as August 5th and not used consistently until the later part of August. I have rear ends as late as August 22 with no "C" Stamp present.

[bcmiller]

I bought this one today.

Unknown build date or VIN possibly from a Nova
C BS 0909G1
341, G 31 9 casting date

[bcmiller]

Attached is a photo of my differential date code on a 69 Z28, 07A car,  BU 0624G2 E.  On the diff, it also has 3894860NF, E189, and GM 57 numbers.  Reading through other posts it should have a C in front of the BU but I don't see one.  I'm new to the group and reading through history and adding info.  Hope this helps as you build data.  I really appreciate all of this great info.

It is fine that is does not have a C in the front.  That started later in the year.

[bcmiller]

Updated January 11, 2023

Remember when submitting data - put all of the information requested in ONE POST - PLEASE.

Some notations have been made for C BU axles where the C has been peened. I did not note this on all of the ones listed.

Here is what we have so far.  We need more data points for axle assembly dates between early June and early August.  My apologies if your data was inadvertently missed.

It appears that the 341 casting number started being used in June. It appears that the 3 letter code had started by early August, possibly earlier.

Remember that there was a shutdown for the latter part of July and into very early August.

01C
BM 0124G1
860, casting date A 21 9

06A - 9N665238
BM 0625G
860, casting date unknown

07A - 9N6687XX
BU 0630G2
860, casting date E 26 9

Unknown build date
BE 0708G1
860, casting date D 28 9

Unknown build date possible over the counter/warranty axle
C 107 231 G1 with 7 and 1 peened out, shows C 10 23 G1
341-A, Casting date E 14 9

08E  9N677954
C BS 0805G
341, casting date G 25 9

08C
C BL 0806G1
341, casting date G 23 9

Unknown build week and/or VIN
C BM 0807G1
860, casting date F 24 9

Unknown
No assembly stamp, possible warranty axle
341, casting date F 28 9

08D  9N6745xx
C BU 0818G2
unknown casting number or date

08D
C BS 0820G2
341, casting date H 11 9

08E, 9N677163
C BL 0812G2
341, casting date H 5 9

08E
C BU 0828G2
341, casting date H 13 9

08E
C BU 0828G2
341, unknown casting date

09A - 9N680789
C BU 0828   
341, unknown casting date

09A
C BU 0826 or 0828
unknown casting number or date

09C
C BU 0829G1
341, casting date G 31 9

Unknown build week and/or VIN
C BS 0829G1
341, casting date H 17 9

09C 9N684457
C BU 0829G1
341, unknown

Unknown build date or VIN possibly from a Nova
C BS 0909G1
341, casting date G 31 9 

09C   9N685397
C BU 0910G1
341, casting date I 2 9

Unknown build week and/or VIN
C BU 0916        C area is peened
341, casting date I 6 9

Unknown build week and/or VIN
C BU 0922G2    C area is peened
341, casting date I 11 9

10A
C BU 0929G1    C area is peened.
341,

Unknown build week and/or VIN
C BS 1028G1
341, casting date J 3 9

Unknown build week and/or VIN
C BE 1030G1 not peened
341, casting date J 3 9 or J 8 9 (hard to read)

[bcmiller]

Found another one. Late 69 Camaro
C BS 1022G1
341 casting

[boomer632]

Build date 06A X66 396
Casting number 860NF
Assembly stamp BU 1126 G1 E
Casting date K228