Special Highway Axle, 3.08:1

Years 1963–79 Models 2 Factory citations 3

Also described as 3.08 axle ratio

Documented applications

Corvette (C1 / C2)

1963 Factory-verified

$2.20; 211 built

GM Heritage factory kit — 1963 Chevrolet Corvette, p.8.
1964 Factory-verified

$2.20; 2,310 built

GM Heritage factory kit — 1964 Chevrolet Corvette, p.17.
1965 Factory-verified

$2.20; 1,886 built

GM Heritage factory kit — 1965 Chevrolet Corvette, p.14.

Impala / Full-Size

1963–70s (varies) Single-source

This page aggregates every documented appearance of G91 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.