R6C ✓ Factory-verified

Chevrolet · Regular Production Option

Control, sales item number 3

Years 2007–08, 2025–26 Models 2 Factory citations 4

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Also described as GCWR, 37,500 lb (17,009 kg)

Also documented for Buick

Documented applications

Silverado Medium Duty (GM515, 2019–2026) →

• 2025–2026 ✓ Factory-verified
  ⛭ GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

Uplander (2005–2008) →

• 2007, 2008 ✓ Factory-verified internal
  ⛭ GM factory document — 2007 chevrolet uplander rpo code list, p.1.

  ⛭ GM factory document — 2008 chevrolet uplander rpo code list, p.1.

This page aggregates every documented appearance of R6C in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.