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Mercruiser lower unit gearcase
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GLM Mercruiser lower gearcase 120 - 140 - 165 - 470 - 888
  • Complete lower gear housing replaces the Mercruiser MC-1/R/MR/Alpha 1 (One)
  • Forward bearing size: outer diameter 3.500 inch (#21590)
  • OEM # 1623-8951A43
  • GLM aftermarket #18100
  • Gear ratio: 13:21
  • For a complete listing of internal components included in the replacement gear housing, see our Mercruiser lower unit drawing page
  • For upper unit gearcase parts, see our Mercruiser upper gearcase page for all parts with photos
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    mercruiser gearcase .jpg
    mercruiser gearcase
    GLM lower unit assembly.jpg
    GLM lower unit assembly
    merc alpha prop shaft .jpg
    merc alpha prop shaft

    ADD TO CART

    # 18100 MerCruiser/Alpha 1 new aftermarket replacement lower unit gear case

    $1136.98

    (Includes shipping within United States and Canada)

    omc@sterndrive.info

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