JC4 ✓ Factory-verified

GMC · Regular Production Option

Brakes, vacuum power, 4-wheel disc, 7,200 lb

Years 2003–07 Models 1 Factory citations 2

Query this via API →

Also documented for Chevrolet

Documented applications

Sierra — GMT800 (1999–2007) →

• 2003–2007 ✓ Factory-verified
  ⛭ GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

This page aggregates every documented appearance of JC4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.