Convenience package, decor level #1

Years 1963–79, 1982–90, 2004–08 Models 3 Factory citations 14

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Also described as Differential carrierTrim package, Durango

Also documented for GMC

Documented applications

Impala / Full-Size

1963–70s (varies) Single-source

3.08 posi

Colorado — GMT355 (2004–2012)

2004–2008 Factory-verified

GM factory document — 2004 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet colorado pickup 2wd rpo code list, p.1.

S-10 pickup — First generation (1982–1993)

1982–1990 Factory-verified

the kits print it as Durango/High Sierra equipment; the 1984 option heading prints YCI

GM Heritage factory kit — 1982 Chevrolet S 10, p.6.
GM Heritage factory kit — 1983 Chevrolet S 10, p.24.
GM Heritage factory kit — 1984 Chevrolet S 10, p.25.
GM Heritage factory kit — 1985 Chevrolet S 10, p.31.
GM Heritage factory kit — 1986 Chevrolet S 10, p.10.
GM Heritage factory kit — 1987 Chevrolet S 10, p.18.
GM Heritage factory kit — 1988 Chevrolet S 10, p.23.
GM Heritage factory kit — 1989 Chevrolet S 10, p.31.
GM Heritage factory kit — 1990 Chevrolet S 10, p.20.

This page aggregates every documented appearance of YC1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.