Brakes, power, heavy duty

Years 1984–87, 1989 Models 2 Factory citations 8

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Also documented for Cadillac Chevrolet

Documented applications

Sierra — Square body (1983–1991)

1984–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits

GM Heritage factory kit — 1984 Chevrolet Truck, p.43.
GM Heritage factory kit — 1985 Chevrolet Truck, p.42.
GM Heritage factory kit — 1986 Chevrolet Truck, p.160.
GM Heritage factory kit — 1987 Chevrolet Truck, p.57.

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

1984, 1986, 1987, 1989 Factory-verified

standard on G20–G30; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1984 Chevrolet G Van, p.16.
GM Heritage factory kit — 1986 Chevrolet G Van, p.62.
GM Heritage factory kit — 1987 Chevrolet G Van, p.42.
GM Heritage factory kit — 1989 Chevrolet G Van, p.11.

This page aggregates every documented appearance of J55 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.