4-Speed Manual, close ratio, heavy duty

Years 1963–79 Models 6 Factory citations 14

Also described as 4-speed manual, close ratio HD ("Rock Crusher")4-speed manual, HD close ratio4-Speed Transmission - Heavy Duty4-Speed Manual, close ratio, heavy duty ("Rock Crusher")4 speed H.D. transmission4-speed manual transmission - heavy duty

Documented applications

Camaro

1968–1969 Factory-verified

Z28/L78

GM Heritage factory kit — 1968 Chevrolet Camaro, p.41.
GM Heritage factory kit — 1969 Chevrolet Camaro, p.47.
1970–1972 Factory-verified

Z28/SS

GM Heritage factory kit — 1970 Chevrolet Camaro, p.9.
GM Heritage factory kit — 1972 Chevrolet Camaro, p.62.

Chevelle / El Camino

1966, 1968–1972 Factory-verified

GM Heritage factory kit — 1966 Chevrolet Chevelle, p.96.
GM Heritage factory kit — 1972 Chevrolet El Camino, p.8.

Corvette (C1 / C2)

1965 Single-source

$171.00; ~30 built per CorvSport only; not listed by CAC, CorvetteStory, or Vette Vues — and the 1965 factory kit does NOT list M22 (only the base 4-speed and M35), corroborating that it was not a cataloged 1965 option
1966 Factory-verified

$237.00; 15 built

GM Heritage factory kit — 1966 Chevrolet Corvette, p.14.
1967 Factory-verified

$237.00; 20 built

GM Heritage factory kit — 1967 Chevrolet Corvette, p.57.

Corvette (C3)

1968 Factory-verified

$263.30; 80 built

GM Heritage factory kit — 1968 Chevrolet Corvette, p.137.
1969 Factory-verified

$290.40; 101 built

GM Heritage factory kit — 1969 Chevrolet Corvette, p.5.
1970 Factory-verified

$95.00; 25 built

GM Heritage factory kit — 1970 Chevrolet Corvette, p.5.
1971 Factory-verified

$100.00; 130 built

GM Heritage factory kit — 1971 Chevrolet Corvette, p.6.

Impala / Full-Size

1963–70s (varies) Confirmed

Muncie

Nova / Chevy II

1968–1969 Factory-verified

GM Heritage factory kit — 1968 Chevrolet Nova Coupe, p.73.
GM Heritage factory kit — 1969 Chevrolet Nova, p.10.

This page aggregates every documented appearance of M22 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.