NR4 ✓ Factory-verified

Hummer · Regular Production Option

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

Years 2003, 2006–09 Models 2 Factory citations 3

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Also documented for CadillacChevroletGMC

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2003 ✓ Factory-verified

  the 2003 list alone prints it as "BW4484 2 speed full time 4WD" (outlier); GM's other lists print the open differential, 2 speed transfer case.

  ⛭ GM factory document — 2003 hummer h2 rpo code list, p.1.

H3 and H3T — GMT345 (2006–2010) →

• 2006–2009 ✓ Factory-verified
  ⛭ GM factory document — 2006 hummer h3 rpo code list, p.1.

  ⛭ GM factory document — 2009 hummer h3 rpo code list, p.1.

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