Mercruiser lower unit gearcase 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