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

Years 2001–05 Models 1 Factory citations 7

Also documented for GMC

Documented applications

Silverado HD — GMT800 (2001–2007)

2001–2005 Factory-verified

GM’s 2002 service list does not print it (the 2002 kit list does); GM prints the converter clutch as Conversion Clutch or CONV Clutch; years from Heritage kit pages, not in GM’s service list of that year: 2002 (kit list)

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado HD, p.62.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.41.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.195.

This page aggregates every documented appearance of M74 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.