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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    U63 Factory-verified

    GMC · Regular Production Option

    Radio, AM

    Years 1983–89 Models 8 Factory citations 33
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    Also documented for BuickCadillacChevroletPontiac

    Documented applications

    Caballero — G-body (1983–1987)
    • 1983–1987 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 — 1983 Chevrolet El Camino, p.6.
      GM Heritage factory kit — 1984 Chevrolet El Camino, p.6.
      GM Heritage factory kit — 1985 Chevrolet El Camino, p.12.
      GM Heritage factory kit — 1986 Chevrolet El Camino, p.6.
      GM Heritage factory kit — 1987 Chevrolet El Camino, p.41.
    Jimmy (full-size) — Square body (1983–1991)
    • 1983–1986 Factory-verified

      shared square-body platform code; cited from the Chevrolet Blazer kit

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.10.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.19.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.12.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.13.
    Jimmy — first generation (1983–1994)
    • 1983, 1986–1987 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.
    Safari — First generation (1985–1994)
    • 1986–1989 Factory-verified

      1987 from the 1987 pages in the kit file named for the following model year; 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 — 1988 Chevrolet Astro Van, p.28, p.8.
      GM Heritage factory kit — 1989 Chevrolet Astro Van, p.13.
    Sierra — Square body (1983–1991)
    • 1984–1987 Factory-verified

      shared platform code; cited from the square-body C/K pickup kits

      GM Heritage factory kit — 1984 Chevrolet Truck, p.46.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.44.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.59.
    Sonoma — first generation (1982–1993)
    • 1983, 1985, 1987–1988 Factory-verified

      shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

      GM Heritage factory kit — 1983 Chevrolet S 10, p.30.
      GM Heritage factory kit — 1985 Chevrolet S 10, p.24.
      GM Heritage factory kit — 1987 Chevrolet S 10, p.23.
      GM Heritage factory kit — 1988 Chevrolet S 10, p.34.
    Suburban — Square body (1983–1991)
    • 1983–1987 Factory-verified

      shared square-body platform code; cited from the Chevrolet Suburban kit

      GM Heritage factory kit — 1983 Chevrolet Suburban, p.17.
      GM Heritage factory kit — 1984 Chevrolet Suburban, p.23.
      GM Heritage factory kit — 1985 Chevrolet Suburban, p.20.
      GM Heritage factory kit — 1986 Chevrolet Suburban, p.21.
      GM Heritage factory kit — 1987 Chevrolet Suburban, p.26.
    Vandura and Rally — Second generation G-series (1983–1996)
    • 1983, 1984, 1986, 1988, 1989 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.18.
      GM Heritage factory kit — 1986 Chevrolet G Van, p.25.
      GM Heritage factory kit — 1988 Chevrolet Vandura, p.23.
      GM Heritage factory kit — 1989 Chevrolet G Van, p.19.

    This page aggregates every documented appearance of U63 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.