Transfer case, 4 wheel drive (4WD), open differential, 2 speed

Years 2003–06 Models 5 Factory citations 20

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Also described as Transfer case, 4WD, open differential, 2-speed

Also documented for Cadillac GMC Hummer

Documented applications

Avalanche — GMT800 (2002–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.33.

Silverado — GMT800 (1999–2007)

2004 Factory-verified

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2004 Chevrolet Silverado, p.67.

Silverado HD — GMT800 (2001–2007)

2004 Factory-verified

GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.

Suburban — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.39.
GM Heritage factory kit — 2005 Chevrolet Suburban, p.164.

Tahoe — GMT800 (2000–2006)

2003–2006 Factory-verified

GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.32.
GM Heritage factory kit — 2005 Chevrolet Tahoe, p.136.

This page aggregates every documented appearance of NR4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.