HC4 ✓ Factory-verified

Hummer · Regular Production Option

Axle, rear, 4.56 ratio

Years 2007–09 Models 1 Factory citations 2

Query this via API →

Also documented for CadillacChevroletGMC

Documented applications

H3 and H3T — GMT345 (2006–2010) →

• 2007–2009 ✓ Factory-verified
  ⛭ GM factory document — 2007 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 HC4 in the Hummer reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.