12 Bolt Axle ID ... Help

[rpoz11]

Was at a friend's shop earlier today.

He pulled out two(2) 12 Bolt axle housings.

One was coded BL 1220G1 ( no E below )
Dated K-8-7

The other was this:

C BS 0930G2
.........E <-----E being under the 9
Date coded I-26-9
Center casting number of 3969341 NF

What does he have???

[Kurt S]

68 3.07 open
late 69 3.31 posi

http://www.camaros.org/drivetrain.shtml#RearAxleNumbers

[rpoz11]

Thanx!

I was looking at that but you didnt have the C prefix codes listed.

I suppose I understand that one should just add the C prefix to the 2 Alpha codes to determine the 69-1/2 codes.

Did you get my emails???

[Kurt S]

It shows up in the text:
Most of these later axles (10 or 12 bolt) would have also been stamped with the 1970 style three digit application code (e.g. CBT instead of just BT).

I thought it would have been confusing to add the extra codes in the table. But next time I edit that page, I'll try to make that part clearer.

Yes, got your email. Have been doing house projects....

Thanks!