I have a 10-bolt rear for my '68 with the appropriate 3894859 stamp on it. It also ends in NF. I'm not seeing on camaros.org what the NF stands for.

Also, this teeth are 41 and 15 for a 2.73 ratio. Was this a common ratio for basic sport coupes? Just curious.

Thanks as always.

The "NF" after the casting number says it was cast from nodular iron (vs. grey iron - there were two different foundries in the Chevrolet-Saginaw Foundry complex - one poured grey iron, the other poured nodular iron). :thumbsup: