Transmission, manual, 3 speed

Years 1983–87 Models 2 Factory citations 9

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Also documented for Chevrolet

Documented applications

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.22.
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.

Vandura and Rally — Second generation G-series (1983–1996)

1983, 1984, 1986, 1987 Factory-verified

standard on G10 and G20 (the 1983 page also on G30 without C6P); shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1983 Chevrolet Vandura, p.6.
GM Heritage factory kit — 1984 Chevrolet G Van, p.8.
GM Heritage factory kit — 1986 Chevrolet G Van, p.15.
GM Heritage factory kit — 1987 Chevrolet G Van, p.14.

This page aggregates every documented appearance of MM3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.