TBL ✓ Factory-verified

GMC · Regular Production Option

Ship thru, produced in Flint Assembly and shipped to Creech Ladders and Racks, Nashville TN, returned to Wentzville Assembly for shipping to final destination

Years 2025–26 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Sierra HD — T1XX (2020–2027) →

• 2025–2026 ✓ Factory-verified internal

  only in: 2500 HD and 3500 HD CC

  ⛭ 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.

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