1WT Factory-verified

Chevrolet · Regular Production Option

Trim group, Work Truck

Years 2006–07, 2016–19, 2022–27 Models 8 Factory citations 29

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Also described as Trim group, Work VanEquipment group: Work Truck (1WT)Package, WT option 1Equipment group

Also documented for GMC

Documented applications

Express — GMT610 (2003–2027)

2025–2027 Factory-verified

GM fleet Cargo models CG23405, CG23705, CG33405, CG33705; Cutaway models CG33503, CG33803, CG33903 (2025–2026), CG33503, CG33803 (2027); shown in the column headings of the guides

GM factory document — 2025 chevrolet express cargo fleet order guide, p.6.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.6.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.6.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide, p.1.

Silverado — GMT800 (1999–2007)

2006–2007 Factory-verified

GM Heritage factory kit — 2006 Chevrolet Silverado, p.248.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.234.

Silverado HD — K2XX (2015–2019)

2016–2019 Factory-verified

2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide

GM factory document — 2016 chevrolet silverado 2500hd fleet order guide wayback, p.1.
GM factory document — 2017 chevrolet silverado 2500hd order guide revised august 12 2016 copy gm authority, p.1.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.77.
GM factory document — 2019 chevrolet silverado 2500hd order guide april 20 2018 iteration 2 copy gm authority, p.77.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

Work Truck: available on all models in the 2500 HD and 3500 HD guides; 2023 Upfitter list prints "Package" with the option number

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.9.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2025 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2025 chevrolet silverado 3500 hd cc fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 3500 hd cc fleet order guide, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2027 chevrolet silverado 3500 hd retail and fleet fleet order guide, p.1.
GM factory document — 2027 chevrolet silverado 3500 hd cc fleet order guide, p.1.

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified

page-1 column heading WT: models CC56403 (2WD regular cab), CC56043 (2WD crew cab), CK56403 (4WD regular cab) and CK56043 (4WD crew cab)

GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide, p.1.

Silverado — T1XX (2019–2026)

2022–2026 Factory-verified

trim group printed under the Work Truck heading of the guides;

GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.9.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.9.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.10.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide, p.1.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide, p.217.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide, p.100.

Tahoe — GMT800 (2000–2006)

2006 Factory-verified

First printed in the 2006 order guide, in the note "Equipment groups 1WT, 1SJ, 1SK, 1SL and 1SM available on C*15706 Models" and as a column heading; no decor name is printed with it

GM Heritage factory kit — 2006 Chevrolet Tahoe, p.107.

This page aggregates every documented appearance of 1WT in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.