Transmission, 4 speed automatic, THM440-T4

Years 1987–91 Models 2

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

Also documented for Buick Chevrolet Oldsmobile

Documented applications

Bonneville — Eighth generation (1987–1991)

1987–1991 Single-source

matched to the unit by meaning: Wikipedia's infobox names the THM440T4 four-speed automatic for the whole generation (its text calls it the 4T60) but prints no code, and the Bonneville Club list, which has no year, prints ME9 with "THM440-T4"

Grand Prix — W-body (1988–1996)

1988–1989 Single-source

the W-Body Page's 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); Wikipedia names a four-speed automatic for 1988 and the only transmission with the 3.1L and the turbo in 1989; the listed Lumina kit pages 1990 p.41 (which prints ME8, not ME9), 1991 p.73 and 1992 p.55 carry no readable model year (only issue or revision dates, with MVMA-80, MVMA-91 and MVMA-82 footers, and a footer form number does not date a page), so they are not cited

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