Mercruiser Outdrive Parts Drawings *How to Videos

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Mercruiser lower unit gear case *New housing

GLM Marine Replacement Lower Unit - Mercruiser Sterndrive models 120 - 140 - 165 - 470 - 888

  • Complete lower unit gear housing replaces the Mercruiser MC-1/R/MR/Alpha 1 (One) with 2 year warranty
  • For 120/140 4 cylinder serial numbers 2791957 - 6225576, 470/485 model serial numbers 4208730 - 6225575, 165 and all V8 models 1971 - 1990
  • Forward bearing size: outer diameter 3.500 inch (#21590)
  • Replaces Mercury outdrive OEM # 1623-8951A43
  • GLM aftermarket #18100 with gear ratio 13:21
  • For upper unit outdrive parts, see our upper gearcase page for all parts with photos

18100 Mercruiser outdrive

18100 Mercruiser outdrive

P/N 18100 GLM Marine complete lower unit
(No core charge required) $1499.95