M99 ✓ Factory-verified

GMC · Regular Production Option

Transmission, automatic, electronic ratio select, GM, strong hybrid, rear-wheel drive

Years 2009 Models 2 Factory citations 2

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Also documented for CadillacChevrolet

Documented applications

Sierra — GMT900 (2007–2013) →

• 2009 ✓ Factory-verified

  only in: Hybrid.

  ⛭ GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Yukon — GMT900 (2007–2014) →

• 2009 ✓ Factory-verified

  only in: Hybrid. Wikipedia names a 2ML70 transmission for the hybrids.

  ⛭ GM factory document — 2009 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of M99 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.