G4Y ✓ Factory-verified

Chevrolet · Regular Production Option

GVWR, 12,100 lb (5,488 kg)

Years 2025–26 Models 1 Factory citations 2

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Also documented for GMC

Documented applications

Silverado HD (T1XX, 2020–2027) →

• 2025–2026 ✓ Factory-verified

  only in: 3500 HD

  ⛭ GM factory document — 2025 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of G4Y in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.