MGM ✓ Factory-verified

Chevrolet · Regular Production Option

Transmission, Allison 10 speed automatic

Years 2023, 2025–27 Models 1 Factory citations 10

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Also documented for GMC

Documented applications

Silverado HD (T1XX, 2020–2027) →

• 2023, 2025–2027 ✓ Factory-verified

  only in: 2500 HD, 3500 HD, 3500 HD chassis cab; the 2026 list omits "Allison"

  ⛭ GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.12.

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

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

  ⛭ GM factory document — 2025 chevrolet silverado 3500 hd cc 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 — 2026 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 3500 hd cc 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.

  ⛭ GM factory document — 2027 chevrolet silverado 3500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 chevrolet silverado 3500 hd cc fleet order guide rpo codes, p.1.

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