Brakes, vacuum power, 4-wheel disc, 6,400 lb

Years 2003–05 Models 2 Factory citations 5

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Also documented for Chevrolet

Documented applications

Sierra — GMT800 (1999–2007)

2003–2005 Factory-verified

2005: heavy-duty models only (GM’s HD list)

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2003–2005 Factory-verified

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2004 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.

This page aggregates every documented appearance of JC3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.