Transmission, manual, 4 speed

Years 1983–91 Models 6 Factory citations 32

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Also documented for Chevrolet Pontiac

Documented applications

Jimmy (full-size) — Square body (1983–1991)

1983–1986, 1990, 1991 Single-source

not with B3J diesel equipment or LS9; 1983–1985 from the power team charts, whose 4 speed column the code heads; the 1990–1991 powertrain pages head the SM465 gearbox with MM4, and the 1990–1991 option pages print MM42 with a footnote mark; shared square-body platform code; cited from the Chevrolet Blazer kit; 1991 rests on the Chevrolet-only 1991 Blazer book, so the row is single-source

GM Heritage factory kit — 1983 Chevrolet Blazer, p.4.
GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.12.
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.

Jimmy — first generation (1983–1994)

1983–1987 Factory-verified

shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.6.
GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.4.
GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.10.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.6.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.42.

Safari — First generation (1985–1994)

1986, 1987 Factory-verified

cargo van with the 2.5L L4 only; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.10.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.12.

Sierra — Square body (1983–1991)

1983–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits

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.

Sonoma — first generation (1982–1993)

1983–1987 Factory-verified

shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

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); shared square-body platform code; cited from the Chevrolet Suburban kit

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 GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.