Advanced Twin-Clutch AWD System

Years 2018–20, 2024–27 Models 3 Factory citations 10

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Also described as Advanced all-wheel drive system, twin clutchDifferential, rear, automatic locking, twin clutch

Also documented for Buick Cadillac GMC

Documented applications

Blazer — C1XX (2019–2026)

2019, 2025–2026 Factory-verified

2LT, 3LT: not available; RS: O; Premier: not available (2025 only); only in: AWD models

GM factory document — 2019 chevrolet all new blazer fleet order guide wayback, p.4.
GM factory document — 2025 chevrolet blazer fleet order guide rpo codes, p.1.
GM factory document — 2025 chevrolet blazer fleet order guide, p.34.
GM factory document — 2026 chevrolet blazer fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet blazer fleet order guide, p.25.

Traverse — C1XX (2018–2024)

2018–2020 Factory-verified

High Country: S; only in: AWD (High Country is AWD only); 2020: GM Authority's 2021 changes page, which lists its deletion for 2021

GM factory document — 2018 chevrolet traverse order guide copy gm authority, p.18, p.57.
GM factory document — 2019 chevrolet traverse order guide copy gm authority, p.20, p.85.

Traverse — Third generation (2024–2027)

2025–2027 Factory-verified

Z71: S; LT, High Country, RS: not offered

GM factory document — 2025 chevrolet traverse fleet order guide, p.8.
GM factory document — 2026 chevrolet traverse fleet order guide, p.9.
GM factory document — 2027 chevrolet traverse fleet order guide, p.9.
2024 Single-source

decoderpo.com's 2024 ALL-NEW Traverse order guide page lists it on its Standart Equipment tab (LS, LT, Z71); the page is a T3 mirror of GM's guide and the repository holds no GM document for 2024

This page aggregates every documented appearance of G99 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.