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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    UM4 Factory-verified

    Chevrolet · Regular Production Option

    AM-FM ETR stereo w/ 8-track

    Years 1981–82 Models 1 Factory citations 2

    Documented applications

    Corvette (C3)
    • 1981 Factory-verified

      $386.00; 8,262 built

      GM Heritage factory kit — 1981 Chevrolet Corvette, p.5.
    • 1982 Factory-verified

      $386.00; 923 built

      GM Heritage factory kit — 1982 Chevrolet Corvette, p.30.

    This page aggregates every documented appearance of UM4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.