Transmission, manual 6 speed, 85 mm, 2.97 1st, 0.57 6th, overdrive

Years 2001–04 Models 1 Factory citations 5

Documented applications

Corvette — C5 (1997–2004)

2001–2004 Factory-verified

2001 kit specification page: standard with the Z06; the 2001–2002 lists print "85mm"

GM factory document — 2001 chevrolet corvette rpo code list, p.1.
GM factory document — 2002 chevrolet corvette rpo code list, p.1.
GM factory document — 2003 chevrolet corvette rpo code list, p.1.
GM factory document — 2004 chevrolet corvette rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Corvette, p.26.

This page aggregates every documented appearance of M12 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.