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

Years 1984, 1988–89 Models 2 Factory citations 1

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Also described as Automatic transaxle, 4 speed (THM 440-T4)

Also documented for Buick Chevrolet Pontiac

Documented applications

Cutlass Ciera — A-body (1982–1996)

1984 Single-source

matched to the unit by meaning: Wikipedia's Ciera article says the 4 speed automatic with overdrive was first available for 1984 and prints no code; only 1984 is claimed (Wikipedia's Turbo-Hydramatic 125 article gives only the platform's span, which does not date this car); shared A-body code; cited from the Chevrolet Celebrity kit, which heads the code on its own option line

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

Cutlass Supreme — W-body (1988–1997)

1988–1989 Single-source

the W-Body Page's Cutlass Supreme transaxle table gives ME9 for the 440T4 with the 2.8L and 3.1L engines, 1988–1989 (an enthusiast page that the tier map never verified, so it is the only code source); the same page words the 1990–1991 4T60 as the same unit with updated numbering and prints no code for it; no listed Lumina kit page of a dated year prints ME9

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