GT4 Factory-verified

Chevrolet · Regular Production Option

Axle, rear, 3.73 ratio

Years 1970–89, 1993–10, 2014–20, 2022–27 Models 37 Factory citations 233

Query this via API →

Also described as 3.73:1 rear axle3.73 rear axleRear axle ratio 3.73

Also documented for Buick Cadillac GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

Camaro

1970s Single-source

C/K Trucks

1973–82 Confirmed

—

Astro — First generation (1985–1994)

1986, 1987, 1993, 1994 Factory-verified

with the LB4 it requires the Z82 trailering package; the 1988 power team chart prints GTA, and the 1991 and 1992 pages print it only in the trailering package requirements.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.10.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.12.
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, 2004, 2005 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.
GM factory document — 2004 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet astro 2wd rpo code list, p.1.

Avalanche — GMT800 (2002–2006)

2002–2006 Factory-verified

GM marks it a duplicate with 5 x 1

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Avalanche, p.53.
GM Heritage factory kit — 2003 Chevrolet Avalanche, p.123.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.122.

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified

The 2007 and 2008 lists add the marker DUP With 5 x 1.

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.
GM Heritage factory kit — 2007 Chevrolet Avalanche, p.140.

Blazer (full-size, K Blazer) — GMT400 (1992–1994)

1993–1994 Factory-verified

the 1992 book prints the 3.42 and 3.73 ratios without codes

GM Heritage factory kit — 1993 Chevrolet Blazer, p.18.
GM Heritage factory kit — 1994 Chevrolet Blazer, p.9.

Blazer (full-size, K5) — Square body (1983–1991)

1983–1986 Factory-verified

power team charts only

GM Heritage factory kit — 1983 Chevrolet Blazer, p.4.
GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.4.
GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.6.
GM Heritage factory kit — 1986 Chevrolet Blazer, p.6.

S-10 Blazer — First generation (1983–1994)

1983–1989 Factory-verified

1989 from the kit filed as 1990 (weight table); the 1989-labelled kit prints this code as G14, so 1989 stays on the 1990 file page

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.4.
GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.20.
GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.29.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.15.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.40.
GM Heritage factory kit — 1988 Chevrolet S 10 Blazer, p.4.
GM Heritage factory kit — 1990 Chevrolet S 10 Blazer, p.13.

Blazer — S-10 second generation (1995–2005)

1995–2005 Factory-verified

GM factory document — 1998 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 1999 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2000 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2001 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2002 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2003 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2005 chevrolet blazer 4wd rpo code list, p.1.
GM Heritage factory kit — 1995 Chevrolet S 10 Blazer, p.5.
GM Heritage factory kit — 1996 Chevrolet S 10 Blazer, p.4.
GM Heritage factory kit — 1997 Chevrolet S 10 Blazer, p.10.
GM Heritage factory kit — 1998 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1999 Chevrolet S 10 Blazer, p.33.

Camaro — Gen 5 Zeta (2010–2015)

2014 Confirmed

GM Authority 2014 RPO list

Camaro — Gen 6 Alpha (2016–2024)

2016, 2019, 2023 Factory-verified

GM factory document — 2016 chevrolet camaro fleet order guide wayback, p.1.
GM factory document — 2019 chevrolet camaro fleet order guide wayback, p.7.
GM factory document — 2023 chevrolet camaro fleet order guide wayback, p.4.

C/K pickup — GMT400 (1988–2000)

1988, 1989, 1993–2000 Factory-verified

GM factory document — 1998 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM Heritage factory kit — 1988 Chevrolet Truck, p.22.
GM Heritage factory kit — 1989 Chevrolet Truck, p.31.
GM Heritage factory kit — 1993 Chevrolet Truck, p.14.
GM Heritage factory kit — 1994 Chevrolet Truck, p.12.
GM Heritage factory kit — 1995 Chevrolet Truck, p.9.
GM Heritage factory kit — 1996 Chevrolet Truck, p.16.
GM Heritage factory kit — 1997 Chevrolet Truck, p.17.

C/K pickup — Square body (1983–1991)

1983–1987 Factory-verified

power team charts only

GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
GM Heritage factory kit — 1984 Chevrolet Truck, p.21.
GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
GM Heritage factory kit — 1986 Chevrolet Truck, p.20.
GM Heritage factory kit — 1987 Chevrolet Truck, p.37.

Colorado — GMT355 (2004–2012)

2004–2009 Factory-verified

the 2004 lists add a duplicate-of-5X1 remark; the 2005 and 2006 lists print GT4 as 4.10 ratio (and GT5 as 3.73), swapped against the 2004 and 2007-2009 lists and the rest of GM's lists, so the common reading is kept.

GM factory document — 2004 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet colorado pickup 2wd rpo code list, p.1.

Express — GMT600 (1996–2002)

1996–2002 Factory-verified

the 2001–2002 lists mark it a duplicate of 5X1

GM factory document — 1998 chevrolet express rpo code list, p.1.
GM factory document — 1999 chevrolet express rpo code list, p.1.
GM factory document — 2000 chevrolet express rpo code list, p.1.
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 — 1996 Chevrolet G Van, p.63.
GM Heritage factory kit — 1997 Chevrolet Express, p.18.

Express — GMT610 (2003–2027)

2003–2010, 2014–2018, 2022–2027 Factory-verified

the 2003–2006 lists mark it a duplicate of 5X1; the 2025–2027 guides read Rear axle, 3.73 ratio; S: Cutaway 1WT CG33903 (2025–2026); O: Cutaway 1WT (2027), Cutaway CG33503 (2025–2026), Cutaway 1WT CG33803 (2025–2026); not offered: Cutaway 2WT (2025–2026); in the 2025–2027 guides only in the Cutaway guides

GM factory document — 2003 chevrolet express rpo code list, p.1.
GM factory document — 2004 chevrolet express awd rpo code list, p.1.
GM factory document — 2005 chevrolet express awd rpo code list, p.1.
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.13.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.6.
GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.13.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.7.
GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.7.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.15.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.14.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.11.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.6.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.11.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.7.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.11.

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

1983, 1984, 1986–1989, 1993–1996 Factory-verified

GM Heritage factory kit — 1983 Chevrolet Vandura, p.6.
GM Heritage factory kit — 1984 Chevrolet G Van, p.8.
GM Heritage factory kit — 1986 Chevrolet G Van, p.18.
GM Heritage factory kit — 1987 Chevrolet G Van, p.14.
GM Heritage factory kit — 1988 Chevrolet Vandura, p.9.
GM Heritage factory kit — 1989 Chevrolet G Van, p.17.
GM Heritage factory kit — 1993 Chevrolet G Van, p.12.
GM Heritage factory kit — 1994 Chevrolet G Van, p.8.
GM Heritage factory kit — 1995 Chevrolet G Van, p.3.
GM Heritage factory kit — 1996 Chevrolet G Van, p.41.

S-10 pickup — First generation (1982–1993)

1982–1989, 1993 Factory-verified

GM Heritage factory kit — 1982 Chevrolet S 10, p.5.
GM Heritage factory kit — 1983 Chevrolet S 10, p.37.
GM Heritage factory kit — 1984 Chevrolet S 10, p.8.
GM Heritage factory kit — 1985 Chevrolet S 10, p.16.
GM Heritage factory kit — 1986 Chevrolet S 10, p.8.
GM Heritage factory kit — 1987 Chevrolet S 10, p.16.
GM Heritage factory kit — 1988 Chevrolet S 10, p.16.
GM Heritage factory kit — 1989 Chevrolet S 10, p.40.
GM Heritage factory kit — 1993 Chevrolet S 10, p.6.

S-10 pickup — Second generation (1994–2004)

1994–2004 Factory-verified

GM factory document — 1998 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 1999 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2000 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2001 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2002 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2003 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet s10 pickup 4wd rpo code list, p.1.
GM Heritage factory kit — 1994 Chevrolet S 10, p.11.
GM Heritage factory kit — 1995 Chevrolet S 10, p.6.
GM Heritage factory kit — 1996 Chevrolet S 10, p.12.
GM Heritage factory kit — 1997 Chevrolet S 10, p.12.

Silverado — GMT800 (1999–2007)

1999–2007 Factory-verified

GM factory document — 1999 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 — 2000 Chevrolet Truck and Silverado, p.56.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.55.

Silverado — GMT900 (2007–2013)

2009 Factory-verified

The list also words it as Axle - Rear 3.73 Ratio.

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

Silverado HD — GMT800 (2001–2007)

2001–2007 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2006 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 2500HD, p.194.

Silverado HD — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

GM factory document — 2007 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet silverado 3500hd cc fleet order guide wayback, p.4.

Silverado HD — K2XX (2015–2019)

2016–2019 Factory-verified

with the Duramax diesel; 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.4.
GM factory document — 2017 chevrolet silverado 2500hd order guide revised august 12 2016 copy gm authority, p.56.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.71.
GM factory document — 2019 chevrolet silverado 2500hd order guide april 20 2018 iteration 2 copy gm authority, p.72.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

only in: 2500 HD, 3500 HD, 3500 HD chassis cab

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.11.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Silverado — K2XX (2014–2019)

2015, 2017, 2018 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.
GM factory document — 2018 chevrolet silverado 1500 fleet order guide copy gm authority, p.167, p.214.

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.

SSR (2003–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet ssr rpo code list, p.1.
GM factory document — 2004 chevrolet ssr rpo code list, p.1.
GM factory document — 2005 chevrolet ssr rpo code list, p.1.
GM factory document — 2006 chevrolet ssr rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1993–1999 Factory-verified

GM Heritage factory kit — 1993 Chevrolet Suburban, p.4.
GM Heritage factory kit — 1994 Chevrolet Suburban, p.8.
GM Heritage factory kit — 1995 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1996 Chevrolet Suburban, p.5.
GM Heritage factory kit — 1997 Chevrolet Suburban, p.11.
GM factory document — 1998 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy suburban 2wd rpo code list, p.1.

Suburban — GMT800 (2000–2006)

2000–2006 Factory-verified

GM marks it a duplicate with 5 x 1; GM's list marks it a duplicate of another code (printed "5 x 1")

GM factory document — 2000 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Suburban, p.46.
GM Heritage factory kit — 2002 Chevrolet Suburban, p.36.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.38.
GM Heritage factory kit — 2004 Chevrolet Suburban, p.40.
GM Heritage factory kit — 2005 Chevrolet Suburban, p.140.

Suburban — GMT900 (2007–2014)

2007–2009 Factory-verified

The 2007 and 2008 lists add the marker DUP With 5 x 1.

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, p.150.

Suburban — Square body (1983–1991)

1983–1989 Factory-verified

power team charts (1983–1988) and the 1989 option weight table

GM Heritage factory kit — 1983 Chevrolet Suburban, p.6.
GM Heritage factory kit — 1984 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.8.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.13.

Tahoe — GMT400 (1995–1999)

1995–1999 Factory-verified

GM factory document — 1998 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 1995 Chevrolet Tahoe, p.2.
GM Heritage factory kit — 1996 Chevrolet Tahoe, p.14.
GM Heritage factory kit — 1997 Chevrolet Tahoe, p.12.
GM Heritage factory kit — 1998 Chevrolet Tahoe, p.40.
GM Heritage factory kit — 1999 Chevrolet Tahoe, p.12.

Tahoe — GMT800 (2000–2006)

2000–2006 Factory-verified

GM marks it a duplicate with 5 x 1; GM's list marks it a duplicate of another code (printed "5 x 1")

GM factory document — 2000 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Tahoe, p.46.
GM Heritage factory kit — 2001 Chevrolet Tahoe, p.43.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.120.
GM Heritage factory kit — 2005 Chevrolet Tahoe, p.135.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.132.

Tahoe — GMT900 (2007–2014)

2007–2009 Factory-verified

The 2007 and 2008 lists add the marker DUP With 5 x 1.

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.137.

TrailBlazer — GMT360 (2002–2009)

2002–2009 Factory-verified

GM Heritage factory kit — 2002 Chevrolet Trailblazer, p.27.
GM factory document — 2002 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet trailblazer 2wd rpo code list, p.1.

This page aggregates every documented appearance of GT4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.