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Mercruiser lower unit gearcase housing

Aftermarket GLM Marine lower gear-case housing

  • OEM 1623-5356A4
  • Forward gear tapered roller bearing bore size: 3.4985 - 3.500 inch inner diameter
  • *Housing does not include any parts or components
  • See our lower gear-case layout page for a complete list of internal parts
  • LM aftermarket upper housing for MerCruiser, go to our upper gear-case page
  • Tech support Exploded view drawings search by part number or description here
  • Alpha One and Alpha One Generation 2 empty lower gear housings also available

17000 lower gearcase

P/N 17000 Empty lower gear housing $1168.95