This product has been superseded by: 6BL-45300-13-8D

Yamaha - Lower Unit Assembly - Gearcase & Drive System - T25LA- 6BL-45300-11-8D

Overview

When your lower unit starts showing wear, you feel it right away—loss of efficiency, rough shifting, or inconsistent performance. This Yamaha lower unit assembly is built to restore that solid, smooth power transfer from engine to prop. It’s designed for dependable operation in real-world conditions, whether you’re running shallow water, cruising, or working the motor day in and day out. Swap it in, and you’re back to reliable performance without second guessing what’s happening below the waterline.

Key Features

• Complete Gearcase Assembly – Restores full lower unit function for smooth power transfer and operation.
• Durable Marine Construction – Built to handle corrosion, wear, and demanding on-water conditions.
• OEM Yamaha Fitment – Engineered to match factory specifications for proper alignment and performance.
• Direct Replacement Design – Ideal for replacing worn or damaged lower units with minimal hassle.

Engine & Boat Compatibility

• T25LA 2016–Current

FAQ

Q: What are signs a lower unit needs replacement?
A: Grinding noise, difficulty shifting, water in gear oil, or reduced performance are common signs.

Q: Is this a complete lower unit assembly?
A: Yes, it’s a full gearcase assembly designed for direct replacement.

Q: Can this improve performance?
A: If your current unit is worn or damaged, replacing it can restore proper power transfer and smooth operation.

Q: Is installation difficult?
A: It’s a more involved job and typically recommended for experienced technicians or mechanics.

Q: Has this part been updated?
A: Yes, it has been superseded by part number 6BL-45300-13-8D.

• Supersessions
  6BL-45300-10-4D, 6BL-45300-11-4D, 6BL-45300-12-8D, 6BL-45300-13-8D, 6BL-45300-13-8D
• Engine Application
  • T25LA 2016–Current