Axle, rear, 3.23 ratio

Years 1989, 1993–02, 2005–09, 2014–15, 2017, 2019–20, 2022–27 Models 19 Factory citations 68

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Also described as Rear axle ratio 3.23Rear axle ratio, 3.23

Also documented for Buick Cadillac GMC Pontiac

Documented applications

Astro — First generation (1985–1994)

1993, 1994 Factory-verified

LB4 engine only.

GM Heritage factory kit — 1993 Chevrolet Astro Van, p.33.
GM Heritage factory kit — 1994 Chevrolet Astro Van, p.10.

Astro — Second generation (1995–2005)

1995–2001 Factory-verified

GM Heritage factory kit — 1995 Chevrolet Astro Van, p.12.
GM Heritage factory kit — 1996 Chevrolet Astro Van, p.17.
GM Heritage factory kit — 1997 Chevrolet Astro Van, p.35.
GM factory document — 1998 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet astro 2wd rpo code list, p.1.

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet avalanche 2wd rpo code list, p.1.

Camaro — Gen 4 (1993–2002)

1993–2002 Factory-verified

the 1994 option weight page (p.64) prints the code as GUS, an OCR reading of GU5 that the citation check does not accept, so 1994 is cited from the performance axle block on p.16

GM factory document — 1998 chevrolet camaro rpo code list, p.1.
GM factory document — 1999 chevrolet camaro rpo code list, p.1.
GM factory document — 2000 chevrolet camaro rpo code list, p.1.
GM factory document — 2001 chevrolet camaro rpo code list, p.1.
GM factory document — 2002 chevrolet camaro rpo code list, p.1.
GM Heritage factory kit — 1993 Chevrolet Camaro, p.88.
GM Heritage factory kit — 1994 Chevrolet Camaro, p.16.
GM Heritage factory kit — 1995 Chevrolet Camaro, p.115.
GM Heritage factory kit — 1996 Chevrolet Camaro, p.115.
GM Heritage factory kit — 1997 Chevrolet Camaro, p.72.

Camaro — Gen 5 Zeta (2010–2015)

2014 Confirmed

GM Authority 2014 RPO list

Caprice — fourth generation, B-body (1991–1996)

1995–1996 Factory-verified

the 1994 sheet prints GUS (an S for the 5), so 1994 is left out

GM Heritage factory kit — 1995 Chevrolet Caprice, p.112.
GM Heritage factory kit — 1996 Chevrolet Caprice, p.114.

Chevy Van — Second generation G-series (1983–1996)

1989, 1993–1995 Factory-verified

GM Heritage factory kit — 1989 Chevrolet G Van, p.35.
GM Heritage factory kit — 1993 Chevrolet G Van, p.66.
GM Heritage factory kit — 1994 Chevrolet G Van, p.17.
GM Heritage factory kit — 1995 Chevrolet G Van, p.3.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide, p.13.

Silverado — GMT800 (1999–2007)

2005–2007 Factory-verified

GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2005 Chevrolet Silverado 1500, p.197.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.55.

Silverado — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.

Silverado — K2XX (2014–2019)

2015, 2017 Factory-verified

GM factory document — 2015 chevrolet silverado 1500 fleet order guide wayback, p.1.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.19.

Silverado — T1XX (2019–2026)

2020, 2022–2026 Factory-verified

GM factory document — 2020 chevrolet silverado 1500 fleet order guide wayback, p.1.
GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.11.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.11.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.13.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

Suburban — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.33.

Suburban — K2XX (2015–2020)

2019 Factory-verified

Premier: A, only with WPK and L86; the 2016 and 2017 shared lists print it, but no Suburban page before 2019 does; 2019 from GM's 2019 Suburban order guide (GM Authority copy)

GM factory document — 2019 chevrolet suburban order guide copy gm authority, p.62.

Suburban — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 chevrolet new suburban fleet order guide, p.7.
GM factory document — 2026 chevrolet suburban fleet order guide, p.7.
GM factory document — 2027 chevrolet suburban fleet order guide, p.7.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.10.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.6.

Tahoe — GMT800 (2000–2006)

2005–2006 Factory-verified

The 2005 and 2006 order guides print it as "Rear axle, 3.23 ratio"

GM Heritage factory kit — 2005 Chevrolet Tahoe, p.115.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.113.

Tahoe — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.28, p.132.

Tahoe — K2XX (2015–2020)

2019 Factory-verified

Premier: A, only with WPK and L86; the 2016 and 2017 shared lists print it, but no Tahoe page before 2019 does; 2019 from GM's 2019 Tahoe order guide (GM Authority copy)

GM factory document — 2019 chevrolet tahoe order guide copy gm authority, p.65.

Tahoe — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 chevrolet new tahoe retail and fleet fleet order guide, p.7.
GM factory document — 2026 chevrolet tahoe retail and fleet fleet order guide, p.7.
GM factory document — 2027 chevrolet tahoe retail and fleet fleet order guide, p.7.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.7.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.10.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.6.

This page aggregates every documented appearance of GU5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.