Transmission, 10-speed automatic (10L80, Gen 1), without ATSS

Years 2023, 2025–27 Models 3 Factory citations 9

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Also described as Transmission, 10 speed automatic

Also documented for Cadillac

Documented applications

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

only with 9C1 or 5W4

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.163.

Suburban — T1XX (2021–2027)

2023, 2026 Factory-verified

the lists print MHU as Gen 1 without ATSS; MHS is Gen 1 with ATSS

GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.7.

Tahoe — T1XX (2021–2027)

2023, 2025–2027 Factory-verified

the body-builder lists print MHU as Gen 1 without ATSS (MHS is Gen 1 with ATSS); 2027: police guides: S on both columns; printed by the Tahoe police package and special service guides, not by the retail and fleet guides; the police guides read 10-speed automatic, electronically controlled with overdrive, with Traction Select System including tow/haul

GM factory document — 2025 chevrolet new tahoe police package and special service fleet order guide, p.7.
GM factory document — 2026 chevrolet tahoe police package and special service fleet order guide, p.7.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.7.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.7.

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