NA1 ✓ Factory-verified

GMC · Regular Production Option

Emission system, GVW less than 8500 lbs

Years 1998–10 Models 9 Factory citations 36

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Also described as Emission system, GVW under 8,500 lbEmission system, GVW less than 8,500 lbsEmissions, GVW 8,500 lb or lessEmission system, GVW less than 8,500 lb

Also documented for CadillacChevrolet

Documented applications

Savana — GMT600 (1996–2002) →

• 1998–2002 ✓ Factory-verified internal

  the 1998–2000 lists read "Under 8,500 Lbs GVW"; the 2001–2002 lists print "GVW Above 8500 LB", the same as NA4

  ⛭ GM factory document — 1998 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 1999 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 2000 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 2001 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 2002 gmc savana rpo code list, p.1.

Savana — GMT610 (2003–2027) →

• 2003–2010 ✓ Factory-verified internal

  ; the 2003–2006 lists print Above 8500 for NA1, the same wording as NA4

  ⛭ 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.17.

  ⛭ GM factory document — 2009 gmc savana rpo code list, p.1.

  ⛭ GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.15.

  ⛭ GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.15.

Sierra — GMT400 (1988–2000) →

• 1998–2000 ✓ 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.

  ⛭ GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.

Sierra — GMT800 (1999–2007) →

• 1999–2000, 2002–2007 ✓ Factory-verified internal

  2005–2007: heavy-duty models only (GM’s HD list)

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

  ⛭ GM factory document — 2000 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ GM factory document — 2002 gmc gmc c sierra 2wd rpo code list, p.1.

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

Sierra HD — GMT800 (2001–2007) →

• 2002–2007 ✓ Factory-verified internal
  ⛭ GM factory document — 2002 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ 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.

  ⛭ GM factory document — 2006 gmc gmc c sierra 2wd rpo code list, p.1.

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

Sierra HD — GMT900 (2007–2014) →

• 2007–2008 ✓ Factory-verified internal
  ⛭ 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.

Yukon — GMT800 (2000–2006) →

• 2000, 2002, 2004–2006 ✓ Factory-verified internal
  ⛭ GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.

  ⛭ GM factory document — 2002 gmc yukon 2wd rpo code list, p.1.

  ⛭ GM factory document — 2004 gmc yukon 2wd rpo code list, p.1.

  ⛭ GM factory document — 2005 gmc yukon 2wd rpo code list, p.1.

  ⛭ GM factory document — 2006 gmc yukon 2wd rpo code list, p.1.

Related codes · mentioned in these notes

NA4

This page aggregates every documented appearance of NA1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.