I'm a little confused by the coding on this rearend. Maybe I'm reading the charts wrong. The casting reads C289 (March 28 69). The housing stamp reads C BL 0120G2 (3.07 open January 20 Detroit 2nd shift) right? And why the C in front?
Does the center housing casting number end in 860 or 341?
Post all of the area by the stamping, with at least 1 inch extra on each side.
It seems that you might have a 1970 Nova rear end.
The 3 letter format for axle codes started around August of 1969. See this related thread.
http://www.camaros.org/forum/index.php?topic=10375.0
Casting date late March 69 and final assembly Jan 20, 1970. That is a long time, but would indicate that Gear & Axle used whatever components were on hand to complete an axle assembly. Probably not "normative" but the plants didn't operate on that principle.
Casting # and larger stamping pics.
It is not common, but it looks like this was a leftover 860 casting that got used for a Nova rear end in January 1970.
The changeover from the 860 to the 341 casting took place in the Summer of 1969. This is the first time I can remember an older casting being used for a rear end, but it has happened before on a few engines.
Thanks for the info. That's a longtime for that casting to sit around before assembly. Nova rearend must be all the same dimensions as it bolted right in the 67 Camaro.
The 68 to 72 Nova 12 bolts ARE the same dimensions.
I found a CBS coded 70 Nova 12 bolt for my nephews 69 Camaro and another CBS for my dad's 70 Nova.