Differential, driver-selectable full-locking rear, e-locking

Years 1963–79, 2017–19, 2021–27 Models 10 Factory citations 23

Also described as 3.31:1 rear axleRear Axle - 3.31:1 Ratio3.31 axle ratioRear axle - 3.31 ratio3.31 rear axle ratioDifferential, rear, driver-selectable full-lockingAxle, rear, electronic locking differential, driver selectDifferential, rear, electronic lockingDifferential, driver-selectable full-locking rear

Also documented for GMC Hummer

Documented applications

Camaro

1967–1969 Factory-verified

GM Heritage factory kit — 1967 Chevrolet Camaro, p.8.
GM Heritage factory kit — 1969 Chevrolet Camaro, p.45.

Chevelle / El Camino

1966–1969 Factory-verified

GM Heritage factory kit — 1966 Chevrolet Chevelle, p.83.
GM Heritage factory kit — 1969 Chevrolet El Camino, p.55.

Impala / Full-Size

1963–70s (varies) Confirmed

Nova / Chevy II

1968 Confirmed

C/K Trucks

1967–72 Single-source

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Colorado — Second generation (GMT31XX) (2015–2022)

2017–2019, 2021–2022 Factory-verified

the upfitter lists read rear electronic locking differential, driver select; 2018 from GM's 2018 Colorado order guide (PDF); 2021 from the upfitter list GM files for 2021 and 2022

GM factory document — 2017 chevrolet canyon colorado electrical body builders manual service manual 2017 en us, p.10.
GM factory document — 2019 chevrolet 19 coloradocanyon body builder sm u 2018aug01 1, p.10.
GM factory document — 2022 chevrolet 22 canyon colorado electrical body builder sm en us 2021oct15, p.10.
GM factory document — 2018 chevrolet colorado order guide copy gm authority, p.13.

Colorado — Third generation (2023–2027)

2023–2027 Factory-verified

ZR2: S; WT, LT, Trail Boss, Z71: not offered

GM factory document — 2023 chevrolet 23colorado electrical body builder, p.11.
GM factory document — 2024 chevrolet 24colorado electrical body builder manual 18272478 2023oct09, p.12.
GM factory document — 2025 chevrolet colorado fleet order guide, p.48.
GM factory document — 2026 chevrolet colorado fleet order guide, p.54.
GM factory document — 2027 chevrolet colorado fleet order guide, p.53.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide, p.12.

Silverado HD (T1XX, 2020–2027)

2025–2027 Factory-verified

only in: 2500 HD

GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Silverado — T1XX (2019–2026)

2022–2026 Factory-verified

GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.11.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.11.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.13.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of G94 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.