The Buckshot Racing #77 Shift Shaft Bushing & Seal kit (assemebeled with the bushing, seal, and o-ring) replaces part number 23-77631A 2 on Mercury outboard engines and MerCruiser Alpha sterndrives.
 
This component plays a critical role in the gearcase or lower unit of the engine. Here are its primary functions:
 
Shift Shaft Bushing:Support and Alignment: The bushing helps to guide and support the shift shaft, ensuring it moves smoothly and accurately within the gearcase. This proper alignment is essential for the correct operation of the shifting mechanism, allowing the engine to switch gears smoothly.
 
Wear Reduction: It reduces friction between the shift shaft and the surrounding components, minimizing wear and tear. This prolongs the lifespan of the shift shaft and the gearcase components.
 
Shift Shaft Seal: Sealing: The seal prevents water, dirt, and other contaminants from entering the gearcase through the shift shaft opening. This is crucial for maintaining the integrity of the gearcase's internal components, including gears and bearings, which need to operate in a clean, oil-filled environment.
 
Leak Prevention: It also prevents oil or lubricants inside the gearcase from leaking out, ensuring that the internal components are properly lubricated and that the gearcase does not run dry.
 
We have the replacement for all Mercury 35-300hp outboards (Sportmaster, Torquemaster, CLE, XR4, XR6, Black Max, 150 HP, 175, 200 HP, xRI, Fleetmaster and alpha sterndrives with part numbers: 18-2155, 21020, 37428A1, 508708, 55419A1, and 23-77631A 2
 
Select optional removal and install tool (replaces part number 91-31107) is a specialized tool designed for use with Mercury Gearcases.
 
This tool is specifically used to remove and install the shift shaft bushing, a critical component in the lower unit or gearcase of the sterndrive.
 
It ensures that the new bushing is installed correctly and securely. Proper installation is crucial to maintain the correct alignment and operation of the shift shaft, which in turn affects the shifting performance of the sterndrive.

Using the correct tool helps prevent damage to the gearcase, nut, shift shaft, and other nearby components, which could occur if improper methods are used.
 
Message or call us 714-697-1716 with your lower unit type if you have any question.