Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One & Alpha One Gen 2 (Replaces 45518T1, 23-805041A2)
Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One & Alpha One Gen 2 (Replaces 45518T1, 23-805041A2) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One & Alph...
Product Details
This aftermarket Shift Lever Kit is designed for MerCruiser stern drives, including MC-I, R, MR, Alpha One, and Alpha One Generation II models with serial numbers 0F094774 and below. It serves as a crucial component within the transom assembly, ensuring smooth and reliable gear shifting.
It directly replaces MerCruiser part numbers 45518T1 and 45518A3, as well as aftermarket equivalents from GLM (21144), Sierra (18-2622), and Mallory (9-72161).
- Installs in the transom assembly.
- Features a metal housing with corrosion-resistant brass components.
- Includes essential bushings and oil seals for a complete repair.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 45518T1 |
| MerCruiser | 45518A3 |
| MerCruiser | 23-805041A2 |
| GLM | 21144 |
| Sierra | 18-2622 |
| Mallory | 9-72161 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this kit is compatible with drives that have serial numbers 0F094774 and below.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| MerCruiser | MC-I | 45518T1 | For S/N 0F094774 & below |
| MerCruiser | R | 45518T1 | For S/N 0F094774 & below |
| MerCruiser | MR | 45518T1 | For S/N 0F094774 & below |
| MerCruiser | Alpha One | 45518T1 | For S/N 0F094774 & below |
| MerCruiser | Alpha One Gen 2 | 45518T1 | For S/N 0F094774 & below |
Technical Specs
- Product Type
- Shift Lever Kit
- Installation
- Transom Assembly
- Housing Material
- Metal (brass components)
- Housing Color
- Metallic
- Dimensions
- 11.5" L × 10.0" W × 2.0" H
- Weight
- 0.13 kg (0.28 lbs)
- Other Technical Attributes
- Corrosion resistant
What’s in the Box
- 1 x Large Bushing
- 1 x Small Bushing
- 2 x Oil Seals
- 1 x Shift Lever Assembly
Installation Notes
- Disconnect the boat's battery and follow all safety precautions.
- Remove the stern drive unit to access the transom assembly.
- Carefully remove the old shift lever, bushings, and seals from the housing. Note their orientation.
- Thoroughly clean the shift lever housing and surrounding area of any debris or corrosion.
- Install the new oil seals and bushings as provided in the kit. Ensure they are seated correctly.
- Install the new shift lever assembly, making sure it engages properly with the shift linkage.
- Reinstall the stern drive unit, bellows, and any other components that were removed.
- Reconnect the battery and test the shifting operation in a safe environment before use on the water.
Troubleshooting & FAQ
How do I know if this shift lever kit fits my MerCruiser drive?
This kit is compatible with MerCruiser MC-I, R, MR, Alpha One, and Alpha One Gen II models. The critical factor is the serial number; it fits drives with serial numbers 0F094774 and below. Always verify your drive's model and serial number before ordering.
What are the signs of a failing shift lever?
Common symptoms include difficulty shifting into forward or reverse, a loose or sloppy feeling in the shift handle, grinding noises during shifting, or the drive popping out of gear. A visual inspection may also reveal corrosion or visible wear on the lever and bushings.
Can a worn shift lever cause gear slippage or hard shifting?
Yes. Excessive play in the shift lever, bushings, or seals can prevent the shift linkage from fully engaging the gears, leading to symptoms like hard shifting, failure to engage a gear, or slipping out of gear under load.
How often should these components be inspected?
It is good practice to inspect the shift linkage components, including the lever and seals, whenever the stern drive is removed for other service (e.g., gimbal bearing or bellows replacement). Replace the components if you notice any significant wear, corrosion, or water intrusion.
Is this a difficult part to install?
Installation requires removing the stern drive, which is a moderately complex task. While it can be done by an experienced DIY boater with the right tools, we recommend professional installation to ensure proper alignment, sealing, and function.
What is the difference between this and the OEM part?
This is an aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a cost-effective solution without compromising on quality or performance, using comparable materials and manufacturing processes.
How fast is shipping?
We ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free, and expedited options are available at checkout where applicable.
What is your warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order number. Returns are accepted for unused items in their original condition within our standard return period.
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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