Transmission, 9 speed automatic

Years 2019–21 Models 2 Factory citations 1

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Also described as Transmission, 9 speed automatic, 9T50, electronically controlled, overdrive

Also documented for Buick Cadillac

Documented applications

Acadia — Second generation (C1XX) (2017–2023)

2020–2021 Single-source

with the LCV engine and a 3.80 axle ratio (GM Authority); GM Authority's 2022 changes page deletes it with the LCV for 2022; 2020: GM Authority 2020 changes page; 2021: GM Authority 2021 Acadia page

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

SLE, SLT: O; Denali: S; only with the LTG engine

GM factory document — 2019 gmc terrain order guide copy gm authority, p.10, p.45.
2020 Single-source

with the LTG engine; 2020 from GM Authority's 2021 changes page, which lists it as deleted for 2021 with the LTG

This page aggregates every documented appearance of M3H in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.