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Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen 2 (Replaces 45518T1)
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Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen 2 (Replaces 45518T1)
This shift lever kit is compatible with MerCruiser sterndrive units from the MC-I, R, MR, Alpha One, and Alpha One Generation 2 series. It is designed for multiple MerCruiser sterndrive applications from 1983 through the present day.
This is a direct aftermarket replacement for Mercury part numbers 45518T1, 45518A3, 23-805041A2, 23-79373A1, 23-79373, and 23-45588. It also replaces popular aftermarket parts including GLM 21144, Sierra 18-2622, and Mallory 9-72161.
- Installation: Direct OEM replacement designed to fit without modification.
- Durable Materials: Features a cast iron shift lever and high-quality brass bushings for longevity.
- Complete Assembly: Includes updated style seals that come pre-installed for a simpler installation.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 45518T1 |
| Mercury | 45518A3 |
| Mercury | 23-805041A2 |
| Mercury | 23-79373A1 |
| Mercury | 23-79373 |
| Mercury | 23-45588 |
| GLM | 21144/87561 |
| Sierra | 18-2622 |
| Mallory | 9-72161 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | MC-I | All | N/A | 1983–1990 | 45518T1 | Serial numbers 6225577 through 0D469858 |
| MerCruiser | R | All | N/A | 1983–1990 | 45518T1 | Serial numbers 6225577 through 0D469858 |
| MerCruiser | MR | All | N/A | 1983–1990 | 45518T1 | Serial numbers 6225577 through 0D469858 |
| MerCruiser | Alpha One | All | N/A | 1983–1990 | 45518T1 | Serial numbers 6225577 through 0D469858 |
| MerCruiser | Alpha One Gen 2 | All | N/A | 1991–present | 45518T1 | Serial numbers beginning with 0D469859 and up |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Shift Lever Kit |
| Installation | Direct OEM replacement |
| Connection | Mechanical shift connection |
| Housing Material | Cast iron (shift lever), brass (bushings) |
| Housing Color | Black/metallic |
| Fitting Type | Direct-fit sterndrive component |
| Other Technical Attributes | Includes updated style seals for improved durability |
Package Contents
- 1 x Shift Lever Assembly (45518A3)
- 1 x Large Bushing
- 1 x Small Bushing
- 2 x Oil Seals (Already installed in the bushing)
Installation Guide
- Ensure the engine is off and disconnect the battery for safety. Position the sterndrive for safe access.
- Following your official service manual, disassemble the drive housing to access the shift lever assembly.
- Carefully remove the old shift lever, bushings, and seals. Clean the component housing of any old sealant, debris, or corrosion.
- Install the new bushings and shift lever assembly into the housing.
- Confirm the pre-installed seals are correctly seated to prevent leaks.
- Reconnect the shift linkage to the new lever and verify smooth movement through Forward, Neutral, and Reverse.
- Reassemble the sterndrive housing using the correct sealant and torque specifications for all bolts.
Troubleshooting & FAQ
Q: How can I be sure this kit fits my Alpha One sterndrive?A: This kit fits MerCruiser Alpha One drives from 1983-1990 (serial numbers 6225577-0D469858) and Alpha One Gen 2 drives from 1991 to present (0D469859 and up). Always check your drive's serial number against the ranges listed in the compatibility table.
Q: What are the symptoms of a failing shift lever?A: Common signs include difficulty shifting into forward or reverse, a loose or sloppy feeling in the shifter, or the drive popping out of gear. Visual inspection inside the drive may show obvious corrosion or wear on the lever itself.
Q: Do I need to buy separate seals or press them in myself?A: No, this kit is a complete solution. It includes the shift lever, large and small bushings, and two new oil seals that come pre-installed in the bushing for your convenience.
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.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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