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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    GU2 Factory-verified

    GMC · Regular Production Option

    Axle, rear, 2.73 ratio

    Years 1983–84 Models 1 Factory citations 2
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    Also documented for CadillacChevroletPontiac

    Documented applications

    Sierra — Square body (1983–1991)
    • 1983, 1984 Factory-verified

      shared platform code; cited from the square-body C/K pickup kits; power team charts only

      GM Heritage factory kit — 1983 Chevrolet Truck, p.13.
      GM Heritage factory kit — 1984 Chevrolet Truck, p.21.

    This page aggregates every documented appearance of GU2 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.