Mercury – Quicksilver Shift Cable Bellows | Driveline Seal | Ribbed Composite | 74639A2

Overview

A watertight seal around your shift cable is vital for protecting your sterndrive from corrosion and internal damage. The Mercury Marine 74639A2 Quicksilver Shift Cable Bellows keeps water out of the shift cable opening, sealing the connection between your drive and transom assembly. Made from tough, flexible composite material, it bends with the drive’s movement without cracking or tearing. Designed for all MerCruiser sterndrives that use a drive unit shift cable, this OEM bellows includes stainless-steel clamps for both ends and installs easily with standard tools.

Key Features

• Purpose: Seals the shift cable entry point to prevent water intrusion into the drive.
• Material: Made from flexible, ribbed marine composite that resists heat, oil, and UV damage.
• Design: Includes stainless-steel hose clamps for secure attachment at both ends.
• Performance: Protects the cable and drive system from moisture, corrosion, and wear.
• Durability: Handles vibration and constant motion without cracking or loosening.
• Ease of Installation: Installs quickly with common tools — no special equipment required.

Engine & Boat Compatibility

• For all MerCruiser sterndrives using a drive unit shift cable

Performance & Real-World Benefits

The 74639A2 bellows provides a tight, flexible barrier that keeps your shift cable and drive internals dry. It moves easily with the drive as you steer or trim, maintaining a strong seal against water intrusion.

A cracked or leaking bellows is one of the most common causes of water damage in sterndrives. Replacing it with this Mercury OEM part helps prevent rust, corrosion, and costly repairs — simple maintenance that pays off in long-term reliability.

Why Choose Mercury OEM

The Quicksilver 74639A2 is a genuine Mercury Marine component, made to the same standards as factory-installed bellows. Aftermarket versions may look similar but often use thinner rubber that wears out faster or doesn’t flex properly.

Mercury’s OEM bellows are designed for durability, perfect fit, and long-term watertight protection. They’re tested under real marine conditions to ensure they seal tight and stay flexible for years.

FAQ

Q1: What drives does this bellows fit?
It fits all MerCruiser sterndrives equipped with a drive unit shift cable.

Q2: What’s included in the kit?
The kit includes the bellows and two stainless-steel hose clamps for both ends.

Q3: What’s the material made from?
A ribbed composite material built to withstand marine heat, oil, and sunlight.

Q4: How do I know when to replace it?
If you see cracks, tears, or signs of wear, it’s time for a replacement — typically every 3–5 years.

Q5: Why use Mercury OEM?
OEM bellows fit perfectly, flex correctly, and offer long-lasting sealing performance that aftermarket parts can’t match.