This product has been superseded by: 69G-45300-23-8D

Yamaha - Lower Unit Assembly - Gearcase Component - 69G-45300-21-8D

Overview

When a lower unit starts wearing out, you’ll notice it right away—vibration, noise, or just not pushing like it used to. This assembly is what transfers engine power into forward motion, and when it’s dialed in, everything feels smooth and solid. I’ve swapped out worn units where the difference was immediate once back in the water. A fresh lower unit like this brings back that clean, confident performance.

Key Features

• Efficient Power Transfer – Converts engine output into smooth and reliable propulsion.

• Precision Gear Alignment – Ensures clean engagement and reduces internal wear.

• OEM Fit Accuracy – Matches Yamaha factory specs for proper installation and performance.

• Corrosion Resistant Construction – Built to handle harsh marine environments including saltwater use.

Engine & Boat Compatibility

Verify compatibility with your specific Yamaha outboard model and part number before installation.

FAQs

Q1: What are signs this lower unit needs replacing?
A: Grinding noise, vibration, water in gear oil, or reduced performance.

Q2: Can I rebuild instead of replacing it?
A: Sometimes, but severe damage usually makes replacement the better option.

Q3: Does this come fully assembled?
A: Yes, it’s designed as a complete unit for direct replacement.

Q4: Will performance improve right away?
A: Yes, especially if the old unit was worn or damaged.

Q5: Is this suitable for saltwater use?
A: Yes, it’s built to handle corrosion from regular saltwater exposure

• Supersessions
  60S-G5300-20-4D, 60S-G5300-21-4D, 69G-45300-20-4D, 69G-45300-21-4D, 69G-45300-22-8D, 69G-45300-23-8D, 69G-45300-23-8D