Automatic transaxle, 4-speed overdrive (THM 440-T4, later named 4T60)

Years 1983–93 Models 2 Factory citations 1

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Also described as Transmission, automatic, 4 speed, THM 440-T4

Also documented for Chevrolet Oldsmobile Pontiac

Documented applications

Century — A-body (1982–1996)

1983–1993 Factory-verified

1983: dated only in the parts catalog; Wikipedia starts the A-body 4-speed in 1984; shared A-body transaxle code, cited from the Chevrolet Celebrity kit for 1984 (its own option line; the air-conditioning entries of 1986–1989 list ME9 only among several units, which dates no year, and the 1985 page prints the code garbled); 1985–1993 from the parts catalog and Wikipedia's Turbo-Hydramatic 125 article, which gives the 4T60 to the A-body 1984–1993

GM Heritage factory kit — 1984 Chevrolet Celebrity, p.41.

Reatta — E-body derivative (1988–1991)

1988–1989 Single-source

the Reatta Owners Journal prints "ME9 - Transmission, auto 4 speed THM440 T4" without a year; Wikipedia's infobox names the 440-T4 for 1988–1989 but prints no code, so the code is matched to the unit by meaning; no GM list in the archive prints ME9

This page aggregates every documented appearance of ME9 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.