Accent color, Maroon Metallic

Years 1983–84 Models 1 Factory citations 2

Also documented for Chevrolet

Documented applications

Caballero — G-body (1983–1987)

1983–1984 Factory-verified

Must be ordered; two-tone accent color with D91 or the Diablo package (YE7 or Z15); the 1984 chart names it Dark Maroon Metallic; shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

GM Heritage factory kit — 1983 Chevrolet El Camino, p.16.
GM Heritage factory kit — 1984 Chevrolet El Camino, p.15.

This page aggregates every documented appearance of 78M in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.