Glass, rear side cargo door

Years 1984, 2023, 2025–27 Models 2 Factory citations 5

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Also described as Chassis group, heavy duty

Also documented for Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2023, 2025–2027 Factory-verified

the 2023 Upfitter list reads Window Pkg - RH Side RR Drs (SEO), the same wording as ZW4; O on all trims; in the 2025–2027 guides only in the Cargo guides

GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.16.
GM factory document — 2025 gmc savana cargo fleet order guide, p.38.
GM factory document — 2026 gmc savana cargo fleet order guide, p.40.
GM factory document — 2027 gmc savana cargo fleet order guide, p.37.

Vandura and Rally — Second generation G-series (1983–1996)

1984 Factory-verified

G31303 cutaway and Hi-Cube vans; includes F60 front springs, G50 rear springs, F59 stabilizer, UA1 battery and K81 generator without dual rear wheels; 1984 from the February 1984 data book pages in the mislabelled G-Van kit file; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1985 Chevrolet G Van, p.84.

This page aggregates every documented appearance of ZW1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.