Transfer case, electric shift control, two speed

Years 1992–09 Models 14 Factory citations 71

Also described as Transfer case, electronic shiftTransfer case, two speed, electric shiftTransfer case, electronic shift, two speedTransfer case, electric shift, 2-speedTransfer case, electric shift control, 2 speed

Also documented for Cadillac GMC Oldsmobile

Documented applications

Avalanche — GMT800 (2002–2006)

2002 Factory-verified

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.

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

1994 Factory-verified

only in: 4WD; instrument panel switch replaces the floor shift lever; the 1992 option page prints the code as Nº1, so 1992 is left out; the merged second-generation doc writes Transfer case, two speed, electric shift

GM Heritage factory kit — 1994 Chevrolet S 10 Blazer, p.53.

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

1995–2005 Factory-verified

1999 list reads selectable shift, push button control

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.7.
GM Heritage factory kit — 1996 Chevrolet S 10 Blazer, p.6.
GM Heritage factory kit — 1997 Chevrolet S 10 Blazer, p.12.
GM Heritage factory kit — 1998 Chevrolet S 10 Blazer, p.23.
GM Heritage factory kit — 1999 Chevrolet S 10 Blazer, p.49.

C/K pickup — GMT400 (1988–2000)

1996–2000 Factory-verified

the kit pages also print NPI

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 — 1996 Chevrolet Truck, p.24.
GM Heritage factory kit — 1997 Chevrolet Truck, p.25.

Colorado — GMT355 (2004–2012)

2004–2009 Factory-verified

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.

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

1992–1993 Factory-verified

only in: 4WD; instrument panel shift selector (1993); the 1992 page prints only electronic shift, 4-wheel drive only

GM Heritage factory kit — 1992 Chevrolet S 10, p.36.
GM Heritage factory kit — 1993 Chevrolet S 10, p.12.

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

1994, 1997–2004 Factory-verified

1999 list reads selectable shift, push button control. The 2002–2004 lists read as the 2001 list.

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.25.
GM Heritage factory kit — 1997 Chevrolet S 10, p.15.

Silverado — GMT800 (1999–2007)

2000–2007 Factory-verified

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

GM factory document — 2000 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.57.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.60.

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 — 2001 Chevrolet Silverado HD, p.62.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.41.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.172.

Silverado HD — GMT900 (2007–2014)

2007–2008 Disputed

printed in the 2007–2008 lists only; the 2009 list prints NQF; disputed: the 2007 and 2008 new-body Silverado lists print it in the heavy-duty half, but that half repeats the 2007 Silverado Classic heavy-duty list (same codes, same order) and no other source names the GMT900 HD gearboxes, so it may be a Classic carryover; both readings kept

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)

1996–1999 Factory-verified

GM Heritage factory kit — 1996 Chevrolet Suburban, p.7.
GM Heritage factory kit — 1997 Chevrolet Suburban, p.15.
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

the 2000 list words it as a full-range transfer case

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.

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.18.
GM Heritage factory kit — 1997 Chevrolet Tahoe, p.15.

Tahoe — GMT800 (2000–2006)

2000–2002 Factory-verified

the 2000 list words it as a full-range transfer case

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.44.
GM Heritage factory kit — 2002 Chevrolet Tahoe, p.30.

This page aggregates every documented appearance of NP1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.