Transmission, 6 speed manual

Years 2009, 2018, 2025–26 Models 3 Factory citations 4

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Also described as Transmission, manual 6 speed, Tremec, 85 mm, 2.66 1st, 0.63 6th

Also documented for Chevrolet

Documented applications

ATS — Alpha (2013–2019)

2018 Factory-verified

only in: ATS-V

GM factory document — 2018 cadillac ats v fleet order guide wayback, p.4.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

only in: CT4-V and CT4-V Blackwing; V-Series Blackwing: S; V-Series Blackwing only; the guides pair it with an upgrade to the 10 speed automatic MHU

GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.10.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.9.

CTS — Sigma II (2008–2015)

2009 Factory-verified

GM factory document — 2009 cadillac cts rpo code list, p.1.

This page aggregates every documented appearance of MG9 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.