Axle, rear, 4.56 ratio

Years 1973–89, 1991–02 Models 10 Factory citations 46

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Also described as 4.56 rear axleAxle, rear, 4.65 ratioRear axle ratio 4.65

Also documented for Cadillac GMC Hummer

Documented applications

C/K Trucks

1973–82 Confirmed

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C/K pickup — GMT400 (1988–2000)

1988, 1993–2000 Factory-verified

GM factory document — 1998 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM Heritage factory kit — 1988 Chevrolet Truck, p.25.
GM Heritage factory kit — 1993 Chevrolet Truck, p.14.
GM Heritage factory kit — 1994 Chevrolet Truck, p.54.
GM Heritage factory kit — 1995 Chevrolet Truck, p.9.
GM Heritage factory kit — 1996 Chevrolet Truck, p.16.
GM Heritage factory kit — 1997 Chevrolet Truck, p.73.

C/K pickup — Square body (1983–1991)

1983–1987 Factory-verified

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.

Express — GMT600 (1996–2002)

1998–2000 Factory-verified

the 2001–2002 lists read 4.65 (next row)

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

the 1998–2000 lists read 4.56 (previous row)

GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Chevy Van — Second generation G-series (1983–1996)

1984, 1993, 1994 Factory-verified

1984 from the 1984 data book pages in the kit file labelled 1985.

GM Heritage factory kit — 1985 Chevrolet G Van, p.74.
GM Heritage factory kit — 1993 Chevrolet G Van, p.66.
GM Heritage factory kit — 1994 Chevrolet G Van, p.17.

Motor Home chassis (1983–1998)

1983–1989, 1991–1995 Factory-verified

1983-1989 power teams column 4.56; 1991-1992 pages use it as the heavy duty rear axle for 14,500 lb GVWR; 1993-1995 charts print 4.56 on the 10,000 lb axle

GM Heritage factory kit — 1983 Chevrolet Motorhome, p.5.
GM Heritage factory kit — 1984 Chevrolet Motorhome, p.7.
GM Heritage factory kit — 1985 Chevrolet Motorhome, p.13.
GM Heritage factory kit — 1986 Chevrolet Motorhome, p.7.
GM Heritage factory kit — 1987 Chevrolet Motorhome, p.11.
GM Heritage factory kit — 1988 Chevrolet Motorhome, p.7.
GM Heritage factory kit — 1989 Chevrolet Motorhome, p.9.
GM Heritage factory kit — 1991 Chevrolet Motorhome, p.3.
GM Heritage factory kit — 1992 Chevrolet Motorhome, p.3.
GM Heritage factory kit — 1993 Chevrolet Motorhome, p.4.
GM Heritage factory kit — 1994 Chevrolet Motorhome, p.5.
GM Heritage factory kit — 1995 Chevrolet Motorhome, p.6.

Silverado — GMT800 (1999–2007)

2000 Factory-verified

GM factory document — 2000 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Truck and Silverado, p.56.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

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

Suburban — GMT800 (2000–2006)

2000 Factory-verified

GM factory document — 2000 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Suburban, p.47.

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

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.

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