Automatic transmission, 3 speed (merchandising code for the THM 125C)

Years 1984–87, 1989 Models 3 Factory citations 7

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Also described as Transmission, 3 speed automaticAutomatic transmission, 3 speed (merchandising code for the THM 125)

Also documented for Chevrolet GMC Oldsmobile Pontiac Saturn

Documented applications

Regal — G-body (1983–1987)

1987 Factory-verified

standard; not with LC2 or WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit

GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.47.

Skyhawk — J-body (1982–1989)

1984, 1986–1987, 1989 Single-source

matched to the unit by meaning: Wikipedia's Skyhawk article names the 3 speed Turbo-Hydramatic 125C automatic in its infobox, and its THM 125 article gives the unit to the J-body, but neither prints a code; the 1986 page prints MXI (letter I); 1985 is left out because the kit's option line is cut off after MX, and 1988 because no listed kit page heads the code; shared J-body code; cited from the Chevrolet Cavalier kit

GM Heritage factory kit — 1984 Chevrolet Cavalier, p.11.
GM Heritage factory kit — 1986 Chevrolet Cavalier, p.37.
GM Heritage factory kit — 1987 Chevrolet Cavalier, p.37.
GM Heritage factory kit — 1989 Chevrolet Cavalier, p.22.

Skylark — X-body (1983–1985)

1984–1985 Single-source

matched to the unit by meaning: Wikipedia's Skylark article names the 3 speed Turbo-Hydramatic 125 automatic in its infobox but prints no code; the pages print MXI (letter I); 1983 is left out because no listed kit page heads the code that year; shared X-body code; cited from the Chevrolet Citation kit

GM Heritage factory kit — 1984 Chevrolet Citation, p.34.
GM Heritage factory kit — 1985 Chevrolet Citation, p.33.

This page aggregates every documented appearance of MX1 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.