Heavy duty 3-speed manual transmission

Years 1963–79 Models 4 Factory citations 6

Also described as HD 3-speed manualHeavy Duty 3-speed TransmissionH.D. clutch

Documented applications

Camaro

1967–1968 Factory-verified

SS; see MC1 for 69

GM Heritage factory kit — 1967 Chevrolet Camaro, p.8.
GM Heritage factory kit — 1968 Chevrolet Camaro, p.30.

Chevelle / El Camino

1966–1968 Factory-verified

GM Heritage factory kit — 1966 Chevrolet Chevelle, p.26.
GM Heritage factory kit — 1968 Chevrolet El Camino, p.6.

Impala / Full-Size

1963–70s (varies) Confirmed

Nova / Chevy II

1965 Confirmed
1968 Factory-verified

GM Heritage factory kit — 1968 Chevrolet Nova Coupe, p.9.
GM Heritage factory kit — 1968 Chevrolet Nova Sedan, p.7.

This page aggregates every documented appearance of M13 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.