M74 ✓ Factory-verified

GMC · Regular Production Option

Transmission, 5 speed automatic, Allison LCT 1000, 3.10 first gear, 1.00 fourth gear, 0.71 fifth gear, overdrive, converter clutch

Years 2001, 2003–05 Models 1 Factory citations 4

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Also documented for Chevrolet

Documented applications

Sierra HD — GMT800 (2001–2007) →

• 2001, 2003–2005 ✓ Factory-verified

  the 2002 list does not print it; GM prints the converter clutch as Conversion Clutch or CONV Clutch

  ⛭ GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ 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 M74 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.