Mercury 350 HP V10 SeaPro Counter-Rotation Long Complete Gearcase (Silver) 8M0235800

Mercury Complete Gearcase 8M0235800 is a genuine Mercury OEM replacement lower unit for select 350 HP 5.7L V10 SeaPro outboards. This assembly is the silver, counter-rotation, Long SeaPro configuration used with Mercury's 6.44-inch gearcase platform.

Compatible with select applications including:

• Mercury 350 HP 5.7L V10 SeaPro
• Counter-rotation SeaPro applications
• Long-shaft configurations where 8M0235800 is specified

This is the complete gearcase assembly, not the basic gearcase housing. Mercury identifies a separate SeaPro counter-rotation basic housing, 8M0228006, along with individually serviceable gears, shafts, bearings, seals, and other internal components.

Mercury offers this V10 SeaPro gearcase in multiple shaft lengths. Related silver counter-rotation SeaPro assemblies include 8M0235799 (CXL), 8M0235801 (CXXL), and 8M0235803 (CXXXL), making shaft length and rotation important when selecting a replacement.

Supersedes/Replaces: 8M0200096, 8M0227999

To Confirm Compatibility: Contact our team with your engine serial number at (727) 596-5929 before ordering.