Axle, rear, 4.56 ratio

Years 1983–89, 1998–02 Models 9 Factory citations 26

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Also described as Axle, rear, 4.65 ratioRear axle ratio 4.65

Also documented for Cadillac Chevrolet Hummer

Documented applications

Savana — GMT600 (1996–2002)

1998–2000 Factory-verified

the 2001–2002 lists read 4.65 (next row)

GM factory document — 1998 gmc savana rpo code list, p.1.
GM factory document — 1999 gmc savana rpo code list, p.1.
GM factory document — 2000 gmc savana rpo code list, p.1.
2001–2002 Factory-verified

the 1998–2000 lists read 4.56 (previous row)

GM factory document — 2001 gmc savana rpo code list, p.1.
GM factory document — 2002 gmc savana rpo code list, p.1.

Sierra — GMT400 (1988–2000)

1998–2000 Factory-verified

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.

Sierra — GMT800 (1999–2007)

2000 Factory-verified

GM factory document — 2000 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra — Square body (1983–1991)

1983–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; power team charts only

GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
GM Heritage factory kit — 1987 Chevrolet Truck, p.39.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Suburban — Square body (1983–1991)

1983–1986, 1988, 1989 Factory-verified

only in: 20/2500 series; power team charts and the 1989 option weight table; the 1987 chart prints HCA, so 1987 is left out; shared square-body platform code; cited from the Chevrolet Suburban kit

GM Heritage factory kit — 1983 Chevrolet Suburban, p.7.
GM Heritage factory kit — 1984 Chevrolet Suburban, p.10.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.10.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.9.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.10.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.13.

Vandura and Rally — Second generation G-series (1983–1996)

1984 Factory-verified

1984 from the February 1984 data book pages in the mislabelled G-Van kit file; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1985 Chevrolet G Van, p.74.

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.
GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.

Yukon — GMT800 (2000–2006)

2000 Factory-verified

GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of HC4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.