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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    MD8 Single-source

    Buick · Regular Production Option

    Transmission, 4 speed automatic, 4L60

    Years 1991–93 Models 1 Factory citations 2
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    Also documented for CadillacChevroletHummerPontiac

    Documented applications

    Roadmaster — B-body (1991–1996)
    • 1991–1993 Single-source

      the hydraulically controlled 4L60 (700R4) behind every engine, replaced for 1994 (Wikipedia's Roadmaster article, which prints no code); the code is from Wikipedia's 4L60-E article, which names the 4L60 as RPO MD8; shared B-body code; cited from the Chevrolet Caprice kit, whose MVMA specification power teams print MD8 for model years 1992 and 1993; 1991 rests on Wikipedia alone, because the kit's 1991 power-team page (p.45) prints MD8 with no readable model year, so the row is single-source; GM's later lists reuse MD8 for a 4L70-E

      GM Heritage factory kit — 1992 Chevrolet Caprice, p.6.
      GM Heritage factory kit — 1993 Chevrolet Caprice, p.22.

    This page aggregates every documented appearance of MD8 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.