MH1 ✓ Factory-verified

Chevrolet · Regular Production Option

Transmission, Allison A1700EVS, 6 speed automatic, close-ratio, double overdrive, emergency service

Years 2025–26 Models 1 Factory citations 2

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Also documented for BuickCadillacOldsmobilePontiac

Documented applications

Silverado Medium Duty (GM515, 2019–2026) →

• 2025–2026 ✓ Factory-verified
  ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of MH1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.