Headlamps, halogen

Years 1983–89, 2008–09 Models 7 Factory citations 17

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

Also documented for Buick Chevrolet

Documented applications

Caballero — G-body (1983–1987)

1985–1986 Factory-verified

The 1987 order guide prints TTA, so 1987 is not claimed; shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

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

Envoy — 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 gmc envoy 2wd rpo code list, p.1.
GM factory document — 2009 gmc envoy 4wd rpo code list, p.1.

Jimmy (full-size) — Square body (1983–1991)

1983 Factory-verified

the option line prints Halogen Hi-Beam; not with V22, TT5 or YE9; shared square-body platform code; cited from the Chevrolet Blazer kit

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

Jimmy — first generation (1983–1994)

1983, 1986–1987, 1989 Factory-verified

shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.44.
GM Heritage factory kit — 1989 Chevrolet Blazer, p.17.

Safari — First generation (1985–1994)

1986, 1987, 1989 Factory-verified

shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

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.

Suburban — Square body (1983–1991)

1983 Factory-verified

not with TT5, V22 or YE9; shared square-body platform code; cited from the Chevrolet Suburban kit

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

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

1983, 1984, 1986, 1988 Factory-verified

shared G-van platform code; cited from the Chevrolet G-Van kit

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.

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