68S-45300-44-8D Yamaha 25" Extra Long Shaft Gearbox | Genuine Used Part

🔧 Product Description

Genuine Yamaha T50 / T60 / FT60 25-Inch High-Thrust Gearcase - Part Number: 68S-45300-44-8D

A genuine Yamaha 25-inch extra-long high-thrust lower unit for selected T50, T60 and FT60 four-stroke outboards. The 68S gearcase uses the larger high-thrust propeller and reduction system designed for heavy boats, displacement hulls and auxiliary applications.

⚙️ Key Features

• Genuine Yamaha high-thrust complete gearcase

• Correct part number 68S-45300-44-8D

• Approximately 25.4-inch extra-long shaft

• Standard high-thrust propeller rotation

• Used on T50 / T60 / FT60 models

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 68S-45300-44-8D is the documented X-shaft high-thrust assembly

• 68S-45300-34-8D is the related approximately 20.9-inch long-shaft assembly

• Standard F50 / F60 gearcases use different ratios and are not direct substitutes

OEM / Related Numbers:

• 68S-45300-44-8D

• 68S-45300-34-8D long-shaft counterpart

• Related high-thrust gear set and large propeller shaft

• Related 25-inch driveshaft and shift rod

• Related high-thrust water-pump and bearing-carrier parts

Aftermarket / Verified Equivalents:

• Specialist remanufactured Yamaha T50 / T60 high-thrust lower units

• Used genuine 68S assemblies

• Aftermarket seal, bearing and water-pump components

• Mercury BigFoot units are not direct equivalents without complete spline, ratio and housing validation

🚤 Compatibility

• Yamaha T50 high-thrust four-stroke models

• Yamaha T60 high-thrust four-stroke models

• Yamaha FT60G and related international high-thrust models

• Documented in 2014, 2021 and 2023 Yamaha parts catalogues

• 25-inch extra-long / X-shaft configuration

• High-thrust ratio and propeller system only

🔌 Function

The high-thrust gearcase uses a deeper reduction and larger propeller architecture to produce greater low-speed thrust while providing shift and cooling-water functions.

Common signs of failure:

• Standard F60 case is substituted for high-thrust unit

• Gear oil contains water

• Large propeller shaft is bent

• Gear or bearing noise develops

• Housing or skeg is damaged

• Wrong 20-inch or 25-inch shaft is installed

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated