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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    H04 Factory-verified

    GMC · Regular Production Option

    Axle, rear, 4.11 ratio

    Years 1983–89 Models 2 Factory citations 14
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    Also documented for Chevrolet

    Documented applications

    Jimmy — first generation (1983–1994)
    • 1983–1989 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.4.
      GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.4.
      GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.10.
      GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.4.
      GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.40.
      GM Heritage factory kit — 1988 Chevrolet S 10 Blazer, p.4.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.15.
    Sonoma — first generation (1982–1993)
    • 1983–1989 Factory-verified

      the 1989 page prints HO4; 1989 from the joint data book's weight page; 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.37.
      GM Heritage factory kit — 1984 Chevrolet S 10, p.8.
      GM Heritage factory kit — 1985 Chevrolet S 10, p.16.
      GM Heritage factory kit — 1986 Chevrolet S 10, p.8.
      GM Heritage factory kit — 1987 Chevrolet S 10, p.16.
      GM Heritage factory kit — 1988 Chevrolet S 10, p.80.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.20.

    This page aggregates every documented appearance of H04 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.