MGU ✓ Factory-verified

GMC · Regular Production Option

Transmission, Allison 10 speed automatic with integrated power take-off (PTO)

Years 2020–27 Models 1 Factory citations 6

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2020–2027 ✓ Factory-verified

  included with the PTO option; the 2026 guides print it without Allison; 2020 to 2024: GM Authority Sierra HD model-year pages pair MGU with the Duramax diesel; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered

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

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.98.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.94.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.88.

Related codes · mentioned in these notes

PTO

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