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.
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Installation: Direct OEM replacement designed to fit without modification.
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Durable Materials: Features a cast iron shift lever and high-quality brass bushings for longevity.
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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?
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Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
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Fast Global Shipping: Free delivery worldwide in 5–15 days.
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Direct from Manufacturer: Competitive pricing without compromising quality.