# 74639A2 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

🔧 Product Description

  

Genuine Quicksilver Shift Cable Bellows Assembly - Part Number: 74639A2

  

Genuine Quicksilver/MerCruiser shift cable bellows assembly for MerCruiser stern drive transom assemblies using a drive unit shift cable. This OEM bellows helps seal the shift cable passage through the transom assembly and protects the cable area from water intrusion, corrosion and premature cable failure.

  

⚙️ Key Features

  

• Genuine Quicksilver/MerCruiser OEM shift cable bellows assembly

• Includes clamps for correct bellows installation

• Used on MerCruiser stern drives with a drive unit shift cable

• Helps seal the shift cable passage at the transom assembly

• Direct replacement for earlier 74639 and 74639B1 / 74639Q02 style bellows references

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 74639A2 → Supersedes 74639B1

• 74639B1 → Supersedes 74639B

• 74639B → Supersedes 74639

• 74639 earlier OEM reference

  

OEM / Related Numbers:

  

• 74639A2

• 74639Q02

• 74639B1

• 74639B

• 74639

• 31659

• 18-2753-2 related replacement reference

  

Aftermarket / Verified Equivalents:

  

• Sierra: 18-2753-2

• GLM: 89170

• Mallory: 9-72702

• REC: REC74639A2

  

🚤 Compatibility

  

Commonly used on:

  

• MerCruiser shift cable bellows applications

• MerCruiser stern drives using a drive unit shift cable

• MerCruiser transom assembly shift cable sealing systems

  

Typically suits:

  

• Engine models:

• MerCruiser #1 stern drives using drive unit shift cable, 1963 and newer

• MerCruiser R stern drives using drive unit shift cable

• MerCruiser MR stern drives using drive unit shift cable

• MerCruiser Alpha One Gen I stern drives using drive unit shift cable

• MerCruiser Alpha One Gen II stern drives using drive unit shift cable

• MerCruiser Bravo One stern drives using drive unit shift cable

• MerCruiser Bravo Two stern drives using drive unit shift cable

• MerCruiser Bravo Three stern drives using drive unit shift cable

• MerCruiser MCM sterndrive transom assemblies using a drive unit shift cable, 1963 and newer

  

• HP Range: Not applicable - stern drive shift cable bellows component

• Engine Type: MerCruiser stern drive transom assembly / shift cable sealing system

• Year Range: 1963 and newer MCM sterndrive applications using a drive unit shift cable

  

🔌 Function

  

The shift cable bellows seals around the drive unit shift cable where it passes through the transom assembly. A sound bellows helps keep water out of the shift cable and transom area, reducing the risk of corrosion, water intrusion and shifting problems.

  

Common signs of failure:

  

• Water leaking into the boat around the transom assembly

• Cracked, split or hardened bellows rubber

• Corroded or stiff shift cable

• Difficult or inconsistent shifting

• Water found in the bellows cavity

• Bellows slipping off the mounting lip

• Clamp corrosion or poor clamp tension

  

📦 Condition

  

• Genuine Quicksilver part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 50.3 AUD
- **Vendor:** Quicksilver
- **Tags:** Quicksilver Marine Parts | Oils Service Kits & Engine Components

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 50.30 AUD | In stock |

## Images

- 74639A2 Mercury MerCruiser Bellows Kit | Genuine Quicksilver OEM Part

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> Source: [Sawley's Auto and Marine](www.sawleysautoandmarine.com.au/products/74639a2-mercury-mercruiser-bellows-kit-genuine-quicksilver-oem-part)
> Updated: 2026-05-17