Shift Cable Bellows Kit – Fits MerCruiser Alpha One, Gen II, Bravo I, II, III Sterndrives (Replaces 74639A2)

Shift Cable Bellows Kit – Fits MerCruiser Alpha One, Gen II, Bravo I, II, III Sterndrives (Replaces 74639A2)

This high-quality shift cable bellows kit is designed to fit all MerCruiser stern drives that utilize a drive unit shift cable from 1963 to present, including R, MR, Alpha One (Gen I & II), and Bravo (I, II, III) models. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and restoring the integrity of your sterndrive assembly.

This component is crucial for protecting the shift cable from water intrusion, which can lead to corrosion and shifting failure. Made from durable, deformation-resistant rubber, this bellows is engineered for a long service life.

• Direct Replacement: Engineered to replace Mercury part 74639A2 and other equivalents for a perfect fit.
• Complete Kit: Includes the necessary C-clamp and hose clamp for a full and secure installation.
• Durable Construction: Manufactured from high-grade rubber designed to resist saltwater, corrosion, and aging.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Shift Cable Bellows Kit (Replaces 74639A2)
• 1 x C-Clamp (Included)
• 1 x Hose Clamp (Included)

Installation Guide

1. Ensure the engine is off, the battery is disconnected, and the sterndrive is trimmed to a safe, accessible position.
2. Locate and carefully remove the old shift cable bellows by loosening the C-clamp and hose clamp.
3. Thoroughly clean the mounting surfaces on the transom assembly and bell housing, removing any old sealant or debris.
4. Carefully slide the new bellows over the shift cable and into its correct position.
5. Secure the large end of the bellows to the transom assembly using the new hose clamp provided.
6. Attach the small end of the bellows to the bell housing using the new C-clamp.
7. Confirm both clamps are fully tightened and that the bellows creates a complete, watertight seal.
8. Shift the drive through its full range of motion to ensure the cable moves freely without binding.

Troubleshooting & FAQ

Q: How do I know if this shift bellows will fit my MerCruiser drive?

A: This bellows fits nearly all MerCruiser sterndrives from 1963 onwards that use a drive unit shift cable. We recommend checking the Part Number Cross-Reference and Compatible Models list on this page against your original part number (74639A2) to confirm fitment.

Q: What are the signs that my shift cable bellows needs replacement?

A: Common signs of failure include visible cracks, brittleness, or splits in the rubber. Water leaking into the bilge area, especially when turning or trimming the drive, is a critical indicator that the bellows has failed and needs immediate replacement to prevent cable damage.

Q: How often should I inspect or replace the shift bellows?

A: It is best practice to inspect your bellows annually or whenever your boat is out of the water for service. We recommend replacement every 3-5 years as part of preventative maintenance, or immediately if any signs of wear, damage, or water leakage are found.

Q: Is this part the same quality as the original Mercury part?

A: This is an aftermarket part designed to meet or exceed OEM specifications. It is made from high-quality, durable rubber resistant to deformation and aging, ensuring a reliable, long-lasting seal for your sterndrive.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.