Window package, right-hand side, rear doors

Years 1969–80, 1986, 1998–99, 2001–02, 2006–10, 2014–18, 2022–27 Models 8 Factory citations 25

Also described as Base 3-speed transmission codeStandard TransmissionBase 4-Speed Wide-Ratio Transmission (standard)Standard 3 speed transmission3-speed manualWindow package, sliding door, rear doors and right rear quarter

Also documented for GMC

Documented applications

Camaro

1969 Confirmed

Chevelle / El Camino

1971–1972 Factory-verified

footnote-flagged in source (Canada/export, build-sheet/tag-only, documentation-only, or package base engine not reported as an option — see chevellestuff legend)

GM Heritage factory kit — 1971 Chevrolet Chevelle, p.62.
GM Heritage factory kit — 1972 Chevrolet El Camino, p.6.

Corvette (C3)

1972 Single-source

$0.00; count n/a (CAC only)

Impala / Full-Size

1970 Confirmed

C/K Trucks

1973–80 Single-source

Modern lists reuse ZW4 (glass pkg)

Astro — First generation (1985–1994)

1986 Factory-verified

cargo van.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.13.

Express — GMT600 (1996–2002)

1998, 1999, 2001, 2002 Factory-verified

GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.
GM Heritage factory kit — 1998 Chevrolet Express, p.33.
GM Heritage factory kit — 1999 Chevrolet G Van, p.66.

Express — GMT610 (2003–2027)

2006–2010, 2014–2018, 2022–2027 Factory-verified

the 2025–2027 guides read Glass, rear doors, side cargo door and rear passenger-side quarter; O on all trims; in the 2025–2027 guides only in the Cargo guides

GM factory document — 2006 chevrolet express rpo code list, p.1.
GM factory document — 2007 chevrolet express awd rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.18.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.9.
GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.19.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.14.
GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.12.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.18.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.15.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.16.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.16.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.14.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.12.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.14.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.13.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.12.

This page aggregates every documented appearance of ZW4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.