Brake system, heavy duty

Years 1967–72, 1988–89, 1992, 1995–96 Models 3 Factory citations 5

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Also described as 3.73 rear axle ratioBrakes, heavy duty

Also documented for Buick

Documented applications

C/K Trucks

1967–72 Single-source

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Caprice — fourth generation, B-body (1991–1996)

1992, 1995–1996 Factory-verified

1992: with B4U (Caprice Classic LTZ); the 1991 and 1994 sheets print JAZ

GM Heritage factory kit — 1992 Chevrolet Caprice, p.43.
GM Heritage factory kit — 1995 Chevrolet Caprice, p.114.
GM Heritage factory kit — 1996 Chevrolet Caprice, p.116.

Celebrity — A-body (1982–1990)

1988–1989 Factory-verified internal

1990 is not claimed: the 1990 wheel table that names it (p.25) carries no readable model-year field

GM Heritage factory kit — 1988 Chevrolet Celebrity, p.27.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.49, p.51.

This page aggregates every documented appearance of JA2 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.