GT4 ✓ Factory-verified

Hummer · Regular Production Option

Axle, rear, 3.73 ratio

Years 2008–09 Models 1 Factory citations 2

Query this via API →

Also documented for BuickCadillacChevroletGMCOldsmobilePontiacSaturn

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2008–2009 ✓ Factory-verified
  ⛭ GM factory document — 2008 hummer h2 rpo code list, p.1.

  ⛭ GM factory document — 2009 hummer h2 rpo code list, p.1.

This page aggregates every documented appearance of GT4 in the Hummer reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.