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) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Shift Cable Bellows Kit – Fits MerCruiser Alpha One, Gen II, Bravo ...
Product Details
This Shift Cable Bellows Kit is engineered for MerCruiser stern drives that use a drive unit shift cable, covering models from 1963 and newer. It fits a wide range of series including R, MR, Alpha One (Gen I & II), and Bravo I, II, & III.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 74639A2, GLM 89080, Sierra 18-2753-2, and Mallory 9-72705.
- Designed for a direct OEM replacement fit.
- Constructed from high-grade rubber resistant to deformation and aging for long service life.
- Includes the necessary C-clamp and hose clamp for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 74639A2 |
| Mercury | 74639B |
| Mercury | 74639B1 |
| Mercury | 74639Q02 |
| GLM | 89080 |
| Sierra | 18-2753-2 |
| Mallory | 9-72705 |
| BPI | BPI89080 |
| SEI | 9A-108-04K |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part fits a wide range of MerCruiser stern drive models. The list below includes common examples.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Alpha One (Gen I) | Various | N/A | 1983–1990 | 74639A2 | Transom Assembly |
| MerCruiser | Alpha One (Gen I) | Various | N/A | 1983–1990 | 74639A2 | Sterndrive Unit |
| MerCruiser | Alpha One Gen II | Various | N/A | 1991–1995 | 74639A2 | |
| MerCruiser | Alpha One Gen II | Various | N/A | 1996–Up | 74639A2 | |
| MerCruiser | Bravo I | Various | N/A | 1988–2013 | 74639A2 | |
| MerCruiser | Bravo II | Various | N/A | 1988–2013 | 74639A2 | |
| MerCruiser | Bravo III | Various | N/A | 1988–2013 | 74639A2 | |
| MerCruiser | Bravo X One | Various | N/A | 1998–2013 | 74639A2 | |
| MerCruiser | Bravo X Two | Various | N/A | 1998–2013 | 74639A2 | |
| MerCruiser | Bravo X Three | Various | N/A | 1998–2013 | 74639A2 | |
| MerCruiser | Bravo XR One | Various | N/A | 1998–2009 | 74639A2 | |
| MerCruiser | Bravo XR Three | Various | N/A | 1998–2009 | 74639A2 | |
| MerCruiser | Bravo XR Sportmaster | Various | N/A | 1998–2009 | 74639A2 | |
| MerCruiser | Bravo XZ One | Various | N/A | 1998–2002 | 74639A2 | |
| MerCruiser | Vazer Drive | Various | N/A | 1998 | 74639A2 | |
| MerCruiser | Vazer Transom | Various | N/A | 1998 | 74639A2 | |
| MerCruiser | I, IA, IB, IC | Various | N/A | 1963–1966 | 74639A2 | |
| MerCruiser | II | Various | N/A | 1962–1969 | 74639A2 | |
| MerCruiser | 120/140 | Various | N/A | 1967–1982 | 74639A2 | |
| MerCruiser | 160/165 | Various | N/A | 1967–1982 | 74639A2 | |
| MerCruiser | 215, 225-S, 228, 233 | Various | N/A | 1970–1977 | 74639A2 | |
| MerCruiser | 250, 260 | Various | N/A | 1977–1982 | 74639A2 | |
| MerCruiser | 470, 485 | Various | N/A | 1976–1982 | 74639A2 | |
| MerCruiser | 888, 898 | Various | N/A | 1971–1982 | 74639A2 | |
| MerCruiser | BlackHawk | Various | N/A | 1993–1998 | 74639A2 |
Technical Specs
- Product Type
- Shift Cable Bellows
- Material
- Rubber
- Installation
- Direct OEM replacement
- Color
- Black
- Includes
- C-clamp and hose clamp
- Other Technical Attributes
- Designed for long service life, resistant to deformation and aging
What’s in the Box
- 1 x Shift Cable Bellows (Replaces 74639A2)
- 1 x C-Clamp
- 1 x Hose Clamp
Installation Notes
- Ensure the engine is off and the drive is in a safe, accessible position. The drive may need to be trimmed up for access.
- Remove the old shift cable bellows by loosening its clamps, noting the orientation.
- Thoroughly clean the mounting surfaces on the transom assembly and bell housing to ensure a clean seal.
- Install the new bellows, making sure it is properly seated and sealed on both ends.
- Secure the bellows using the new C-clamp and hose clamp provided. Ensure they are tight.
- After installation, operate the shift control to verify the cable moves smoothly without binding or resistance.
Troubleshooting & FAQ
How do I know if this bellows will fit my specific MerCruiser model?
This part is designed for all MerCruiser stern drives using a drive unit shift cable from 1963 onward. To be certain, cross-reference your existing part number with our "Part Number Matrix" and check your model and year in the "Engine & Model Compatibility" table.
What are the signs of a failing shift cable bellows?
Common signs include visible cracks, splits, brittleness, or perishing of the rubber. A leaking bellows is a serious issue, as it will allow water into the gimbal housing and bilge area, which can quickly damage the shift cable, gimbal bearing, and other components.
How often should the shift cable bellows be replaced?
It is recommended to inspect all bellows annually for signs of wear or damage. As a preventative measure, bellows should be replaced every 3-5 years, depending on usage and environmental conditions (saltwater vs. freshwater).
Is this part difficult to install?
Installation can be performed by experienced DIY mechanics, but it requires working in tight spaces and attention to detail to ensure a perfect, watertight seal. Due to the critical nature of this part, professional installation is recommended to prevent water intrusion and subsequent damage.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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