Headlamps, halogen

Years 1983–89, 2008–09 Models 9 Factory citations 25

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Also described as Headlamps, halogen, high and low beamHeadlamps, halogen, high and low beamsHeadlamps, halogen, 4

Also documented for Buick GMC

Documented applications

Astro — First generation (1985–1994)

1986, 1987, 1989 Factory-verified

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.14.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.27.
GM Heritage factory kit — 1989 Chevrolet Astro Van, p.13.

Blazer (full-size, K5) — Square body (1983–1991)

1983 Factory-verified

the 1983 option line prints Halogen Hi-Beam; not with V22, TT5 or YE9

GM Heritage factory kit — 1983 Chevrolet Blazer, p.9.

S-10 Blazer — First generation (1983–1994)

1983–1987, 1989 Factory-verified

some option pages print TTA

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.21.
GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.30.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.14.
GM Heritage factory kit — 1989 Chevrolet Blazer, p.17.

Camaro — Gen 3 (1982–1992)

1985–1987 Factory-verified

GM Heritage factory kit — 1985 Chevrolet Camaro, p.33.
GM Heritage factory kit — 1986 Chevrolet Camaro, p.22.
GM Heritage factory kit — 1987 Chevrolet Camaro, p.34.

El Camino — fifth generation (1983–1987)

1985–1986 Factory-verified

The 1987 order guide prints TTA, so 1987 is not claimed

GM Heritage factory kit — 1985 Chevrolet El Camino, p.12.
GM Heritage factory kit — 1986 Chevrolet El Camino, p.6.

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

1983, 1984, 1986, 1988 Factory-verified

GM Heritage factory kit — 1983 Chevrolet Vandura, p.17.
GM Heritage factory kit — 1984 Chevrolet G Van, p.17.
GM Heritage factory kit — 1986 Chevrolet G Van, p.65.
GM Heritage factory kit — 1988 Chevrolet Vandura, p.22.

Monte Carlo — fourth generation (1983–1988)

1985–1987 Factory-verified

standard on the LS coupe (1986–1987)

GM Heritage factory kit — 1985 Chevrolet Monte Carlo, p.30.
GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.32.
GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.42.

Suburban — Square body (1983–1991)

1983 Factory-verified

not with TT5, V22 or YE9; the wording follows the merged K5 Blazer doc

GM Heritage factory kit — 1983 Chevrolet Suburban, p.16.

TrailBlazer — GMT360 (2002–2009)

2008, 2009 Factory-verified

the 2008–2009 lists mark it not for use after 2009 global/new major programs

GM factory document — 2008 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet trailblazer 2wd rpo code list, p.1.

This page aggregates every documented appearance of TT4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.