Yamaha - Lower Unit Assembly - Drivetrain Component - 64D-45300-03-8D

Overview

When a lower unit starts wearing out, you’ll notice it right away—rough shifting, vibration, or loss of smooth power to the prop. This Yamaha lower unit assembly is built to bring everything back to solid, dependable operation. It’s designed to bolt up clean and deliver steady performance without the guesswork. Once installed, you’ll feel the difference in how the boat handles and responds under throttle.

Key Features

• Smooth Power Transfer – Delivers consistent propulsion from engine to propeller.

• OEM Yamaha Fitment – Built to factory specifications for proper alignment and installation.

• Heavy-Duty Gearcase Design – Designed to handle demanding marine use and load conditions.

• Corrosion-Resistant Construction – Holds up in both freshwater and saltwater environments.

Engine & Boat Compatibility

• Compatible with select Yamaha outboards (confirm fitment by model and year)

FAQ

Q: What are signs the lower unit needs replacement?
A: Grinding noise, slipping gears, or water in the gear oil are common signs.

Q: Can I rebuild instead of replacing it?
A: Minor issues can be repaired, but major internal damage usually requires full replacement.

Q: Will this improve performance right away?
A: Yes, you’ll notice smoother shifting and better power delivery after installation.

Q: Is this suitable for saltwater use?
A: Yes, with proper flushing and maintenance, it holds up well in saltwater.

• Supersessions
  64C-45300-00-8D, 64C-45300-01-8D, 64D-45300-00-4D, 64D-45300-00-8D, 64D-45300-01-00, 64D-45300-01-8D, 64D-45300-02-8D, 64D-45300-04-8D, 64D-45300-04-8D, 64D-45300-20-4D