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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    MD9 Factory-verified

    Chevrolet · Regular Production Option

    Automatic transaxle, 3 speed (THM 125C)

    Years 1983–96, 1998–02 Models 9 Factory citations 47
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    Also described as Transaxle, 3-speed automatic (3T40)Automatic transaxle, 3-speed (THM 125C)Transmission, automatic, 3 speedTransaxle, 3 speed automatic

    Also documented for BuickOldsmobilePontiac

    Documented applications

    Beretta — L-body (1987–1996)
    • 1988–1996 Factory-verified

      the 1988 and 1989 pages name it the 125C, the 1990–1991 pages THM 125c (Hydra-Matic 3T40) and the 1992–1996 pages the 3T40 transaxle assembly; sold as MX1 in the order guides; same description as cavalier-gen2 and cavalier-gen1; cavalier-gen3 reads MD9 as "Transaxle, 3-speed automatic (3T40)"

      GM Heritage factory kit — 1988 Chevrolet Beretta, p.6.
      GM Heritage factory kit — 1989 Chevrolet Beretta, p.6.
      GM Heritage factory kit — 1990 Chevrolet Beretta, p.26.
      GM Heritage factory kit — 1991 Chevrolet Beretta, p.6.
      GM Heritage factory kit — 1992 Chevrolet Beretta, p.6.
      GM Heritage factory kit — 1993 Chevrolet Beretta, p.4.
      GM Heritage factory kit — 1994 Chevrolet Beretta, p.62.
      GM Heritage factory kit — 1995 Chevrolet Beretta, p.21.
      GM Heritage factory kit — 1996 Chevrolet Beretta, p.33.
    Cavalier — first generation (1982–1987)
    • 1986–1987 Factory-verified

      GM engineering code on the power team pages, available with both engines; the 1982–1985 power team pages name the 125C automatic without a code; the option pages sell it as MX1

      GM Heritage factory kit — 1986 Chevrolet Cavalier, p.4.
      GM Heritage factory kit — 1987 Chevrolet Cavalier, p.4.
    Cavalier — second generation (1988–1994)
    • 1988–1992, 1994 Factory-verified

      GM engineering code, with both engines; sold as MX1; the 1991 kit names it the Hydra-Matic 3T40 and the Cavalier third-generation doc reads it as the 3T40; 1988: named only in the option-weight remarks for power steering; 1994: from the final drive table

      GM Heritage factory kit — 1988 Chevrolet Cavalier, p.42.
      GM Heritage factory kit — 1989 Chevrolet Cavalier, p.39.
      GM Heritage factory kit — 1990 Chevrolet Cavalier, p.15.
      GM Heritage factory kit — 1991 Chevrolet Cavalier, p.40.
      GM Heritage factory kit — 1992 Chevrolet Cavalier, p.41.
      GM Heritage factory kit — 1994 Chevrolet Cavalier, p.39.
    Celebrity — A-body (1982–1990)
    • 1983–1990 Factory-verified

      GM engineering code on the power-team pages; the option-weight pages and the 1989 order guide sell the same unit as MX1; 1982 is not claimed: the page that prints it (1982 p.5) carries no readable model-year field

      GM Heritage factory kit — 1983 Chevrolet Celebrity, p.5.
      GM Heritage factory kit — 1984 Chevrolet Celebrity, p.41.
      GM Heritage factory kit — 1985 Chevrolet Celebrity, p.5.
      GM Heritage factory kit — 1986 Chevrolet Celebrity, p.5.
      GM Heritage factory kit — 1987 Chevrolet Celebrity, p.9.
      GM Heritage factory kit — 1988 Chevrolet Celebrity, p.7.
      GM Heritage factory kit — 1989 Chevrolet Celebrity, p.29.
      GM Heritage factory kit — 1990 Chevrolet Celebrity, p.5.
    Citation — X-body (1983–1985)
    • 1984–1985 Factory-verified

      the power team pages call it the 125C automatic; the 1984 and 1985 pages print MD9 only in the remarks of other items ("RPO-MD9 Automatic Transmission"), never as an option line, and do not say 3 speed (the 3 speed reading comes from the 125C power team pages); named in the air conditioning remarks and as the unit MX1 orders; the Celebrity doc reads it as the THM 125C automatic transaxle

      GM Heritage factory kit — 1984 Chevrolet Citation, p.33.
      GM Heritage factory kit — 1985 Chevrolet Citation, p.32.
    Corsica — L-body (1987–1996)
    • 1989–1996 Factory-verified

      the 1989 power teams page names it the 125C; sold as MX1 in the order guides; same description as beretta-gen1

      GM Heritage factory kit — 1989 Chevrolet Corsica, p.20.
      GM Heritage factory kit — 1990 Chevrolet Corsica, p.18.
      GM Heritage factory kit — 1991 Chevrolet Corsica, p.6.
      GM Heritage factory kit — 1992 Chevrolet Corsica, p.6.
      GM Heritage factory kit — 1993 Chevrolet Corsica, p.4.
      GM Heritage factory kit — 1994 Chevrolet Corsica, p.16.
      GM Heritage factory kit — 1995 Chevrolet Corsica, p.16.
      GM Heritage factory kit — 1996 Chevrolet Corsica, p.11.
    Lumina APV — U-body (1990–1996)
    • 1992–1995 Factory-verified

      with the LG6; the MVMA specification code for the 3 speed automatic that the 1990 dealer specifications page lists as MX1 (see MX1); 1991 is not claimed: the axle page's automatic transmission (MD9) heading (p.31) sits on a page whose model year field reads 1901, so it is not dated

      GM Heritage factory kit — 1992 Chevrolet LuminaAPV, p.6.
      GM Heritage factory kit — 1993 Chevrolet LuminaAPV, p.4.
      GM Heritage factory kit — 1994 Chevrolet LuminaAPV, p.4.
      GM Heritage factory kit — 1995 Chevrolet LuminaAPV, p.7.
    Lumina — first generation, W-body (1990–1994)
    • 1990–1993 Factory-verified

      base transmission with the LR8, LN2 and LH0; the 1991 p.42 and 1993 transmission pages name it the Hydra-Matic (the 1993 p.43 page the Hydra-Matic 3T40); sold as MX1 in the order guides; the 1990 and 1993 power-teams pages print MDS; the 1991 p.42 and 1993 pp.40–41, 43 entries print the code in a parenthetical after the transmission name and the 1990 p.40 and 1993 p.69 curb-mass pages in the model's equipment parenthetical, which count as entries on MVMA pages (controller ruling); 1990 is cited only from the p.40 curb-mass page because the 1990 transmission page (p.19) has no readable model-year field, and 1991 only from p.42 because the 1991 power-teams page (p.25) has none

      GM Heritage factory kit — 1990 Chevrolet Lumina, p.40.
      GM Heritage factory kit — 1991 Chevrolet Lumina, p.42.
      GM Heritage factory kit — 1992 Chevrolet Lumina, p.6.
      GM Heritage factory kit — 1993 Chevrolet Lumina, p.40, p.41, p.43, p.69.

    Related codes · mentioned in these notes

    LG6LH0LN2LR8MX1

    This page aggregates every documented appearance of MD9 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.