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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    U39 Factory-verified

    GMC · Regular Production Option

    Gage package, voltmeter, temperature and oil pressure gages, trip odometer

    Years 1986–87 Models 1 Factory citations 2
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    Also documented for Chevrolet

    Documented applications

    Caballero — G-body (1983–1987)
    • 1986–1987 Factory-verified

      Shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

      GM Heritage factory kit — 1986 Chevrolet El Camino, p.6.
      GM Heritage factory kit — 1987 Chevrolet El Camino, p.41.

    This page aggregates every documented appearance of U39 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.