Performance Traction Management

Years 1985–87, 2014–27 Models 3 Factory citations 15

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Also described as IROC sport equipment package

Also documented for Cadillac

Documented applications

Camaro — Gen 3 (1982–1992)

1985–1987 Factory-verified

only in: Z28

GM Heritage factory kit — 1985 Chevrolet Camaro, p.36.
GM Heritage factory kit — 1986 Chevrolet Camaro, p.42.
GM Heritage factory kit — 1987 Chevrolet Camaro, p.34.

Corvette — C7 (2014–2019)

2014–2019 Factory-verified

only in: Stingray with Z51, Grand Sport, Z06, ZR1; Grand Sport, Z06, ZR1: S; Stingray Z51: O; 2016, 2019: from GM order-guide copies (Corvette Action Center; 2019 also GM Authority)

GM factory document — 2014 chevrolet corvette stingray fleet order guide wayback, p.1.
GM factory document — 2015 chevrolet corvette fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet corvette fleet order guide wayback, p.1.
GM factory document — 2018 chevrolet corvette fleet order guide wayback, p.5.

Corvette — C8 (2020–2027)

2020–2027 Factory-verified

GM factory document — 2020 chevrolet corvette stingray order guide copy corvetteblogger, p.39.
GM factory document — 2021 chevrolet corvette fleet order guide wayback, p.1.
GM factory document — 2022 chevrolet corvette stingray order guide copy corvetteblogger, p.50.
GM factory document — 2023 chevrolet corvette stingray z06 order guide copy corvetteblogger, p.93.
GM factory document — 2024 chevrolet corvette stingray z06 e ray order guide copy corvetteblogger, p.149.
GM factory document — 2025 chevrolet corvette fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet corvette fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet corvette fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of B4Z in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.