Transmission, manual, 4 speed

Years 1976–92 Models 12 Factory citations 51

Also described as 4-speed manual (later Saginaw/BW coding)4-speed wide-ratio manual transmission4-speed manual transmissionTransmission, manual 4 speedTransmission, manual 4 speed, with overdrive

Also documented for GMC Pontiac

Documented applications

Camaro

late 1970s Confirmed

Corvette (C3)

1978 Factory-verified

$0.00; 4,773 built; factory kit confirms RPO MM4 on the option index (p.22)

GM Heritage factory kit — 1978 Chevrolet Corvette, p.22.
1980 Factory-verified

$0.00; 5,726 built

GM Heritage factory kit — 1980 Chevrolet Corvette, p.62.
1981 Disputed

$0.00 (Corvette Black Book); count disputed: CAC shows 5,575 vs CorvSport, CorvetteStory and the Corvette Black Book 5,757; final year a manual was offered until 1984

GM Heritage factory kit — 1981 Chevrolet Corvette, p.5.

Nova / Chevy II

1978–1979 Factory-verified

GM Heritage factory kit — 1978 Chevrolet Nova, p.58.
GM Heritage factory kit — 1979 Chevrolet Nova, p.56.

Astro — First generation (1985–1994)

1986, 1987 Factory-verified

cargo van with the 2.5L L4 only; the 1987 feature page says a Warner Gear four speed replaced the Muncie under the same code.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.11.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.12.

Blazer (full-size, K5) — Square body (1983–1991)

1983–1986, 1990, 1991 Factory-verified

not with B3J diesel equipment or LS9; the 1990–1991 powertrain pages name the SM465 gearbox; the 1990–1991 option pages print MM42 with a footnote mark

GM Heritage factory kit — 1983 Chevrolet Blazer, p.4.
GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.4.
GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.6.
GM Heritage factory kit — 1986 Chevrolet Blazer, p.10.
GM Heritage factory kit — 1990 Chevrolet Blazer, p.6.
GM Heritage factory kit — 1991 Chevrolet Blazer, p.6.

S-10 Blazer — First generation (1983–1994)

1983–1987 Factory-verified

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.6.
GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.20.
GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.29.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.6.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.42.

Camaro — Gen 3 (1982–1992)

1982–1984 Factory-verified

GM Heritage factory kit — 1982 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1983 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1984 Chevrolet Camaro, p.5.

C/K pickup — GMT400 (1988–2000)

1988–1992 Factory-verified

the 1990 and 1991 transmission tables list it as the 4 speed manual (SM465); the 1992 kit citation prints the code only inside another option's cross-reference (no defining line found)

GM Heritage factory kit — 1988 Chevrolet Truck, p.22.
GM Heritage factory kit — 1989 Chevrolet Truck, p.28.
GM Heritage factory kit — 1990 Chevrolet Truck, p.18.
GM Heritage factory kit — 1991 Chevrolet Truck, p.18.
GM Heritage factory kit — 1992 Chevrolet Truck, p.33.

C/K pickup — Square body (1983–1991)

1983–1987 Factory-verified

GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
GM Heritage factory kit — 1987 Chevrolet Truck, p.37.

Corvette — C4 (1984–1996)

1984–1988 Factory-verified

the 1988 convertible order guide (p.36) requires B4P, KC4 and V01 with it

GM Heritage factory kit — 1984 Chevrolet Corvette, p.18.
GM Heritage factory kit — 1985 Chevrolet Corvette, p.50.
GM Heritage factory kit — 1986 Chevrolet Corvette, p.106.
GM Heritage factory kit — 1987 Chevrolet Corvette, p.8.
GM Heritage factory kit — 1988 Chevrolet Corvette, p.32.

S-10 pickup — First generation (1982–1993)

1982–1987 Factory-verified

the 1990 powertrain chart (p.8) prints it only as a column heading whose marks are unreadable, and no 1988–1993 page offers it otherwise, so 1990 is not claimed

GM Heritage factory kit — 1982 Chevrolet S 10, p.5.
GM Heritage factory kit — 1983 Chevrolet S 10, p.37.
GM Heritage factory kit — 1984 Chevrolet S 10, p.8.
GM Heritage factory kit — 1985 Chevrolet S 10, p.16.
GM Heritage factory kit — 1986 Chevrolet S 10, p.8.
GM Heritage factory kit — 1987 Chevrolet S 10, p.16.

Suburban — Square body (1983–1991)

1983–1990 Factory-verified

not on the C10/R10 series; not with LE8, L19 or B3J diesel equipment (1983–1988); 1988 from the power team chart; 1990 from the transmission table, which heads its 4 speed column with MM4, and a requirement remark on the 1990 convenience package entry, which pairs MM4 with the diesel equipment (the 1990 4 speed manual option line has no code)

GM Heritage factory kit — 1983 Chevrolet Suburban, p.13.
GM Heritage factory kit — 1984 Chevrolet Suburban, p.16.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.16.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.22.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.17.
GM Heritage factory kit — 1990 Chevrolet Suburban, p.7.
GM Heritage factory kit — 1990 Chevrolet Suburban, p.18.

This page aggregates every documented appearance of MM4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.