3-speed manual

Years 1973–75, 1978–79, 1982 Models 3 Factory citations 2

Also described as 3-speed manual transmission

Documented applications

Monte Carlo

1973–1975 Single-source

nominal base transmission, rarely built

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.

C/K Trucks

c. 1982 Single-source

Modern lists reuse MM3

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