GU5 Factory-verified

GMC · Regular Production Option

Axle, rear, 3.23 ratio

Years 1989, 1998–01, 2005–09, 2014–20, 2022–27 Models 12 Factory citations 43

Query this via API →

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

Also documented for Buick Cadillac Chevrolet Pontiac

Documented applications

Safari — Second generation (1995–2005)

1998–2001 Factory-verified

GM factory document — 1998 gmc safari 2wd rpo code list, p.1.
GM factory document — 1999 gmc safari 2wd rpo code list, p.1.
GM factory document — 2000 gmc safari 2wd rpo code list, p.1.
GM factory document — 2001 gmc safari 2wd rpo code list, p.1.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation 3SB: O; Elevation 3VL: not offered; AT4, AT4X, Denali, Denali Ultimate: S

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.8.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — GMT800 (1999–2007)

2005–2007 Factory-verified

GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

Sierra — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra — K2XX (2014–2019)

2014, 2016–2018 Factory-verified

GM factory document — 2014 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.19.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.88.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.11.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.12.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.12.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.11.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.13.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.11.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

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

1989 Factory-verified

shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1989 Chevrolet G Van, p.35.

Yukon — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2009 gmc yukon 2wd rpo code list, p.1.

Yukon — K2XX (2015–2020)

2015–2019 Factory-verified

Denali: S; 2019 from the Graphite Performance Edition (YF0) contents; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.19.
GM factory document — 2019 gmc yukon denali fleet order guide wayback, p.1.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.34.

Yukon — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.10.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.10.
GM factory document — 2025 gmc new yukon denali fleet order guide, p.10.
GM factory document — 2026 gmc yukon denali fleet order guide, p.10.
GM factory document — 2027 gmc yukon fleet order guide, p.10.

Yukon XL — K2XX (2015–2020)

2015–2017 Factory-verified

SLE, SLT: not available (the Denali column is lost in the Wayback capture)

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.8.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.19.

Yukon XL — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.10.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.10.
GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.10.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.10.
GM factory document — 2027 gmc yukon xl fleet order guide, p.10.

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