Quicksilver 8M0137263 Upper Shift Shaft for MerCruiser Alpha One Gen II Sterndrive

The Quicksilver 8M0137263 Upper Shift Shaft is a genuine OEM Mercury Marine replacement part designed for MerCruiser Alpha One Generation II sterndrive systems. This critical drivetrain component transfers shift input from the control cable through the transom assembly, engaging forward and reverse gears in the sterndrive unit. Using an authentic Quicksilver part ensures precise fit, reliable operation, and long service life.

Key Features:

• Genuine OEM Quicksilver/Mercury Marine part — not aftermarket
• Designed for MerCruiser Alpha One Gen II sterndrive units (serial number 2A629407 and up)
• Direct OEM replacement for Mercury part numbers 816685 and 8M0125304
• Compatible with Sierra aftermarket cross-reference numbers 18-2169 and 18-3749
• Also cross-references GLM part number GLM21419 and OMC/Johnson/Evinrude OEM 0509382
• Sold individually (each)

OEM & Cross-Reference Part Numbers:

• Mercury/Quicksilver OEM: 8M0137263
• Supersedes: 8M0125304, 816685
• Sierra: 18-2169, 18-3749
• GLM: 21419
• OMC/Johnson/Evinrude: 0509382

Mercury Marine and Quicksilver products carry a 1-year factory warranty against defects in materials and workmanship. Whether performing routine maintenance or a critical sterndrive repair, installing genuine OEM components ensures your drive system performs as designed.