B4L Factory-verified

GMC · Regular Production Option

Label, price, refer to geographic chart

Years 1998–99, 2003–10 Models 8 Factory citations 22

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Also described as Label, price, refer geographic chart

Also documented for Cadillac Chevrolet

Documented applications

Canyon — GMT355 (2004–2012)

2004, 2009 Factory-verified internal

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

Savana — GMT610 (2003–2027)

2003–2006, 2008–2010 Factory-verified internal

GM factory document — 2003 gmc savana rpo code list, p.1.
GM factory document — 2006 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.16.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.14.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.14.

Sierra — GMT400 (1988–2000)

1998–1999 Factory-verified internal

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.

Sierra — GMT800 (1999–2007)

2003–2005 Factory-verified internal

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2003–2005 Factory-verified internal

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2004 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT900 (2007–2014)

2007–2008 Factory-verified internal

the Sierra Classic list of 2007 prints it as BL4

GM factory document — 2007 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2008 gmc sierra 2wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified internal

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

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified internal

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

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