I've already looked at TC's rear end page and didn't have any luck. It came off of a GM 12 bolt and that's all I know. I would appreciate any help. Here are the codes:

-Passengers side axle = CX0220B

-CONI

-3959038NF

-1234

If im not mistaken it is a 1969 chevelle 3.07 open rear built on feb 20th in buffalo.

Agree. CX is used on numerous years for a 3.07 but the casting, 3959038NF, is for a 69. CONI and 1234 are foundry marks.

Ref: Chevellestuff.com > Quick Links > Axle Codes (http://www.chevellestuff.com/generic/axlecodes.htm)

Thanks.