B4L Factory-verified

Chevrolet · Regular Production Option

Label, price, refer to geographic chart

Years 1998–99, 2003–10 Models 8 Factory citations 24

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Also described as Label, price, refer geographic chart

Also documented for Cadillac GMC

Documented applications

C/K pickup — GMT400 (1988–2000)

1998, 1999 Factory-verified internal

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.

Colorado — GMT355 (2004–2012)

2004, 2009 Factory-verified internal

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

Express — GMT610 (2003–2027)

2003–2006, 2008–2010 Factory-verified internal

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 — 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.14.

Silverado — GMT800 (1999–2007)

2003–2005 Factory-verified internal

GM factory document — 2003 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 Heritage factory kit — 2003 Chevrolet Silverado 1500, p.45.
GM Heritage factory kit — 2004 Chevrolet Silverado, p.64.

Silverado HD — GMT800 (2001–2007)

2003–2005 Factory-verified internal

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.

Silverado HD — GMT900 (2007–2014)

2007–2008 Factory-verified internal

the Silverado Classic list of 2007 prints it as BL4

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

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified internal

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.

Tahoe — GMT400 (1995–1999)

1998–1999 Factory-verified internal

GM factory document — 1998 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet tahoe 2wd rpo code list, p.1.

This page aggregates every documented appearance of B4L in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.