Mercury – Quicksilver 815822A55 Complete Standard Rotation (RH) Gearcase | Alpha One Gen II Sterndrives | 2.00 Gear Ratio | 815822A55

Overview

When your drive starts to show its age, the best fix is a true factory replacement. The Quicksilver 815822A55 Standard Rotation Gearcase gives your MerCruiser or Quicksilver Alpha One Gen II sterndrive a second life with the same performance and dependability it had the day it left the factory. Built for units with a 2.00:1 gear ratio, this complete OEM gearcase is made to handle years of hard running, from weekend cruises to long hauls offshore.

This isn’t a reconditioned part or an aftermarket copy. It’s the real deal — built with Mercury’s alloys, coatings, and precision-cut gears to keep your boat running smooth and quiet every trip.

Key Features

• Purpose: Complete OEM replacement that restores smooth shifting, power delivery, and quiet operation.
• Fitment: For MerCruiser and Quicksilver Alpha One Gen II sterndrives with a 2.00:1 gear ratio (right-hand rotation).
• Build Quality: Cast from XK360 low-copper aluminum alloy that resists corrosion and flex under load.
• Protection: Finished with Mercury’s Tri-Paint system, a triple-layer barrier designed to withstand saltwater abuse.
• Gear Design: Spiral-cut steel bevel gears ensure quiet, strong, and efficient power transfer.

Engine & Boat Compatibility

• Standard rotation (RH) Alpha One Gen II sterndrives
• 2.00:1 gear ratio applications
• Found on popular single-drive setups: runabouts, bowriders, cruisers, and sport boats

Performance & Practical Benefits

A gearcase replacement is a big investment, and this one’s built to make it count. The 815822A55 delivers the same feel and performance your boat had when it was new — crisp shifting, solid acceleration, and quiet running. The spiral-cut gears are machined for precision, reducing vibration while transferring torque smoothly through the prop shaft.

The XK360 housing holds up to constant stress and salt exposure, and the Tri-Paint finish keeps corrosion at bay. Once installed, you’ll notice steadier handling, cleaner gear engagement, and a quieter cruise — all signs of a drive that’s working exactly as it should.

Why Buy OEM

There’s no substitute for Mercury’s original engineering. Every OEM Quicksilver gearcase is built with exact factory tolerances and tested for real-world conditions — high torque, shifting under load, and constant exposure to saltwater.

Aftermarket cases often fall short. Even tiny differences in gear alignment or housing materials can cause noise, vibration, or early wear. Choosing OEM means everything fits right, runs smooth, and lasts longer — no surprises, no do-overs.

FAQ

Q1: What drives use the Quicksilver 815822A55 gearcase?
A: It fits MerCruiser and Quicksilver Alpha One Gen II sterndrives with a 2.00:1 gear ratio in standard (RH) rotation.

Q2: Is it fully assembled?
A: Yes. It’s a complete, ready-to-install gearcase built to OEM standards.

Q3: What makes it corrosion-resistant?
A: The housing uses XK360 low-copper alloy coated in Mercury’s Tri-Paint system — a three-layer barrier that protects against salt, heat, and oxidation.

Q4: Can I install it myself?
A: It’s a direct replacement, but due to the precision required, many boaters choose to have it installed by a certified technician.

Q5: Why OEM over aftermarket?
A: OEM gearcases are quieter, longer-lasting, and built to the same specs your drive was originally designed for. You get factory performance and peace of mind.