Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen 2 (Replaces 45518T1)

Shift Lever Kit – Fits MerCruiser MC-I, R, MR, Alpha One, Alpha One Gen 2 (Replaces 45518T1)

This shift lever kit is compatible with a wide range of MerCruiser sterndrive units, including the MC-I, R, MR, Alpha One, and Alpha One Generation 2 series. It is designed for drives manufactured from 1983 to the present, covering serial numbers from 6225577 through current production models.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 45518T1, 45518A3, 23-805041A2, 23-79373A1, 23-79373, and 23-45588; GLM 21144/87561; Sierra 18-2622; and Mallory 9-72161.

• Engineered for a direct OEM replacement fit, simplifying installation.
• Constructed with a cast iron shift lever and durable brass bushings for longevity.
• Includes updated style seals for improved performance and durability.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

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.

Technical Specifications

Package Contents

• 1 x Shift Lever Assembly (45518A3)
• 1 x Large Bushing
• 1 x Small Bushing
• 2 x Oil Seals

Installation Guide

Professional installation is recommended. The following are general steps for replacement:

1. Ensure the engine is off and the battery is disconnected for safety. Place the sterndrive in the forward gear position.
2. Drain the gear lube from the sterndrive unit completely.
3. Remove the lower unit (outdrive) to gain access to the lower shift shaft and lever assembly area.
4. Carefully disconnect the old shift linkage and note its orientation.
5. Remove the old shift lever, bushings, and seals from the housing. Take care not to scratch the housing surfaces.
6. Thoroughly clean the recess in the gear housing where the components were located.
7. Install the new oil seals and bushings, applying a light coat of marine-grade grease.
8. Install the new shift lever assembly into position.
9. Reconnect the shift linkage, ensuring it moves freely and is correctly aligned.
10. Reinstall the lower unit using a new gasket kit.
11. Refill the sterndrive with the manufacturer-specified gear lube to the correct level.
12. After reassembly, test the shifting operation (forward, neutral, reverse) before operating the vessel in water.

Troubleshooting & FAQ

How do I confirm this fits my MerCruiser drive?

Check your drive's serial number. This kit is designed for MC-I, R, MR, and Alpha One drives with serial numbers ranging from 6225577 through 0D469858. It also fits all Alpha One Gen 2 drives with serial numbers 0D469859 and higher.

What are the signs my shift lever needs to be replaced?

Common symptoms of a failing shift lever include difficulty shifting between gears, the drive slipping out of gear, grinding noises during shifts, or excessive play in the shift mechanism. Visual inspection may also reveal corrosion, damage, or wear on the lever and its seals.

What is the difference between this kit and the OEM version?

This is an aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications for fit and function. It is made from comparable high-quality materials and includes updated style seals for enhanced durability.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.