2.71 SG 8 3/4 Exsist?

I'm looking into buying a 8 3/4 center section from a 742 case for $100. The guy says its a 2.71 gear on the tag. I can't find that Chrysler used that ratio anywhere in their history of sure grip 8 3/4's. Someone enlighten me before I make a bad purchase!
Author: admin