GU4 Factory-verified

Chevrolet · Regular Production Option

Axle, rear, 3.08 ratio

Years 1970–89, 1991–04, 2009, 2014–19 Models 30 Factory citations 120

Also described as 3.08:1 rear axleOptional Rear Axle Ratio (3.08 carrier)Rear axle - 3.08 ratio3.08 rear axleRear axle ratio 3.08

Also documented for Buick Cadillac GMC Oldsmobile Pontiac

Documented applications

Camaro

1970s Confirmed

Corvette (C3)

1974 Single-source

$12.00; 1,219 built (GU4 code label only on Corvette Action Center; option itself in 3 sources; the factory kit price schedule lists axle codes G92/G95, not GU4)

Nova / Chevy II

1975 Single-source

C/K Trucks

1973–82 Confirmed

—

Astro — First generation (1985–1994)

1986–1988 Factory-verified

power team charts.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.10.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.12.
GM Heritage factory kit — 1988 Chevrolet Astro Van, p.4.

Avalanche — GMT800 (2002–2006)

2002 Factory-verified

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Avalanche, p.53.

Avalanche — GMT900 (2007–2013)

2009 Factory-verified

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

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)

1994 Factory-verified

GM Heritage factory kit — 1994 Chevrolet S 10 Blazer, p.52.

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

1995–2004 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 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 4 (1993–2002)

1997–2002 Factory-verified

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 — 1997 Chevrolet Camaro, p.72.

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

1991–1996 Factory-verified

1991: requires G80 or V92

GM Heritage factory kit — 1991 Chevrolet Caprice, p.80.
GM Heritage factory kit — 1992 Chevrolet Caprice, p.43.
GM Heritage factory kit — 1993 Chevrolet Caprice, p.62.
GM Heritage factory kit — 1994 Chevrolet Caprice, p.65.
GM Heritage factory kit — 1995 Chevrolet Caprice, p.112.
GM Heritage factory kit — 1996 Chevrolet Caprice, p.114.

C/K pickup — GMT400 (1988–2000)

1988, 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 — 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.

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

1983, 1984, 1986, 1987, 1993 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.15.
GM Heritage factory kit — 1987 Chevrolet G Van, p.15.
GM Heritage factory kit — 1993 Chevrolet G Van, p.64.

Impala SS — seventh generation (1994–1996)

1994–1996 Factory-verified

the only ratio on the order-guide power teams

GM Heritage factory kit — 1994 Chevrolet Impala, p.57.
GM Heritage factory kit — 1995 Chevrolet Impala, p.41.
GM Heritage factory kit — 1996 Chevrolet Impala, p.45.

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

1982–1984, 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 — 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.12.
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)

1999–2001, 2003–2004 Factory-verified

GM factory document — 1999 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 Heritage factory kit — 2000 Chevrolet Truck and Silverado, p.56.
GM Heritage factory kit — 2004 Chevrolet Silverado, p.65.

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.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

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)

2000–2002 Factory-verified

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 Heritage factory kit — 2000 Chevrolet Suburban, p.47.
GM Heritage factory kit — 2002 Chevrolet Suburban, p.36.

Suburban — GMT900 (2007–2014)

2009, 2014 Factory-verified

Trim marks in the 2014 guide: LS, LT, LTZ: S.

GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet suburban fleet order guide wayback, p.4.

Suburban — K2XX (2015–2020)

2015–2019 Factory-verified

S on all trims; not with NHT; 2018–2019 from GM's 2018 and 2019 Suburban order guides (GM Authority copies)

GM factory document — 2015 chevrolet suburban fleet order guide wayback, p.4, p.5.
GM factory document — 2016 chevrolet suburban fleet order guide wayback, p.4, p.5.
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.
GM factory document — 2018 chevrolet suburban order guide copy gm authority, p.4.
GM factory document — 2019 chevrolet suburban order guide copy gm authority, p.4.

Suburban — Square body (1983–1991)

1983, 1984, 1986, 1988, 1989 Factory-verified

power team charts and the 1989 option weight table; the 1985 and 1987 charts print GUA, so those years are left out

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

Tahoe — GMT400 (1995–1999)

1996–1999 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 — 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)

2000–2002 Factory-verified

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 Heritage factory kit — 2000 Chevrolet Tahoe, p.47.
GM Heritage factory kit — 2001 Chevrolet Tahoe, p.43.
GM Heritage factory kit — 2002 Chevrolet Tahoe, p.29.

Tahoe — GMT900 (2007–2014)

2009, 2014 Factory-verified

Trim marks in the 2014 guides: Police: S.

GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet tahoe police vehicle fleet order guide wayback, p.4.

Tahoe — K2XX (2015–2020)

2015–2019 Factory-verified

S on all trims; not with NHT; 2018–2019 from GM's 2018 and 2019 Tahoe order guides (GM Authority copies)

GM factory document — 2015 chevrolet tahoe fleet order guide wayback, p.1, p.5.
GM factory document — 2016 chevrolet tahoe fleet order guide wayback, p.4, p.5.
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.
GM factory document — 2018 chevrolet tahoe order guide copy gm authority, p.4.
GM factory document — 2019 chevrolet tahoe order guide copy gm authority, p.4.

This page aggregates every documented appearance of GU4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.