This part is supersedes from 6AX-45300-20-8D

Yamaha - Lower Unit Assembly - Gearcase & Drive System - LF300 - LF350 - 6AX-45300-24-8D

Overview

On Yamaha’s big offshore motors, the lower unit takes a serious beating every time you push the throttle. This assembly is built for LF300 and LF350 platforms, delivering smooth, consistent power transfer even under heavy load. Whether you're running long distances, carrying weight, or dealing with rough water, having a solid gearcase underneath you matters. Swap in a fresh unit like this and you’ll feel the difference right away—clean shifting, steady performance, and no second guessing when you're miles from shore.

Key Features

• Heavy-Duty Gearcase Assembly – Designed to handle high horsepower and offshore demands.
• Smooth Power Transfer – Ensures efficient delivery of engine power to the prop.
• Corrosion-Resistant Build – Built to withstand harsh saltwater and extended use.
• OEM Yamaha Fitment – Precision-engineered for proper alignment and reliable performance.

Engine & Boat Compatibility

• LF300 - 2007-Current
• LF350 - 2007-Current

FAQ

Q: What are signs a lower unit needs replacement?
A: Grinding noise, vibration, shifting issues, or water in the gear oil are common signs.

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

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

Q: Is installation difficult?
A: It’s a more advanced repair and usually handled by experienced technicians.

Q: Does this replace an older part number?
A: Yes, it supersedes 6AX-45300-20-8D.

• Engine Application
  • LF300 - 2007-Current
  • LF350 - 2007-Curre t