A6T ✓ Factory-verified

GMC · Regular Production Option

Ship thru, Silao, Mexico to General Truck Body, Arlington, TX, and back to Arlington Assembly

Years 2025–27 Models 2 Factory citations 4

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Also described as Ship thru, General Truck Body, Arlington, TX

Also documented for Chevrolet

Documented applications

Sierra 1500 — Next-Generation (2027) →

• 2027 ✓ Factory-verified internal
  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.111.

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026) →

• 2025–2026 ✓ Factory-verified internal

  built at Silao, Mexico; returned to Arlington Assembly for final shipping

  ⛭ GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of A6T in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.