one more book and I found it:
LOTS of coverage:
case, differential less gears
72 Chevelle P.T. with 4:10
67 Chevelle P.G. w/AIR exc P/Trac, 3.08, 3.36, 3.55, 3.70 ratio
67-68 Camaro, Chevy w/ 2.56, 2.73, ratio exc P/Trac
68-69 Pass w/T.H. 2.56, 2.73 ratio exc P/Trac
68 Chevelle w/2.73 ratio exc P/Trac
69 Chevy, Chevelle, Camaro w/2.56, 2.73 ratio exc P/Trac
70 All w/2.56, 2.73 ratio exc P/Trac
71 Chevelle, Nova w/2.56, 2.73 exc P/Trac
similar numbers:
my 71 dated parts book calls for 3869315 as being a case less differential gears for 71 chevelle, nova w/p/Trac w/3.07, 3.31, 3.55 ratio (Eaton ED 30140) use w/ 12 bolt cover
that is
one number off what yours is ...
3869314 is for a 64-71 Corvette ... and is an Eaton 30117
send 5% of the sale proceeds to your favorite charity for me
