Mercury 15" Lower Unit | 2.33:1 Gear Ratio | Fits 1962–1972 Mercury 90HP, 100HP & 115HP Outboards | New | 1-Year Warranty

Product Overview

Restore the performance of your classic Mercury outboard with this new Mercury 15-Inch Lower Unit, designed for 1962–1972 Mercury 90HP, 100HP, and 115HP outboard engines. Built to OEM specifications, this complete lower unit provides dependable shifting, efficient power transfer, and long-lasting durability, making it an excellent replacement for worn or damaged gearcases. Each lower unit is professionally inspected and prepared for installation. The unit has been pressure tested, fitted with a new water pump impeller, and carefully inspected to ensure reliable performance. Internal gears are retained only if they meet OEM standards, with worn components replaced as required. Backed by a 1-Year Working Warranty, this Mercury lower unit is an ideal solution for restoring vintage Mercury outboards.

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Key Features

• New Mercury 15-Inch Lower Unit
• Fits Classic Mercury 90HP, 100HP & 115HP Outboards
• 2.33:1 Gear Ratio
• Pressure Tested
• New Water Pump Impeller Installed
• Internal Components Professionally Inspected
• Smooth, Reliable Shifting
• Ready for Installation
• 1-Year Working Warranty

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Technical Specifications

Specification	Details
Brand	Mercury
Product Type	Complete Lower Unit
Condition	New
Shaft Length	15 Inches
Gear Ratio	2.33:1
Driveshaft Length	16 Inches
Driveshaft Splines	8
Prop Shaft Splines	15
Warranty	1-Year Working Warranty

Driveshaft length is measured from the top of the water pump to the top of the driveshaft.

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Inspection & Preparation

Every lower unit undergoes a professional inspection before shipment, including:

• Internal gearcase opened and inspected
• Pressure tested to ensure seal integrity
• New water pump impeller installed
• Internal gears inspected and replaced if necessary
• Ready for installation

Important: Gear oil is not included. The lower unit is shipped dry and must be filled with the correct marine gear lubricant before operation.

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Compatible Applications

Designed for select Mercury outboards including: Model Years

• 1962–1972

Horsepower

• 90 HP
• 100 HP
• 115 HP

Shaft Length

• 15-Inch (Short Shaft)

Gear Ratio

• 2.33:1

Important: Always verify your engine's model number, serial number, shaft length, gear ratio, and spline count before purchasing. If you need assistance confirming compatibility, our team is happy to help before you order.

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Condition

This Mercury lower unit is new and professionally prepared for service. Inspection highlights include:

• New lower unit assembly
• Pressure tested
• New water pump impeller installed
• Internal components professionally inspected
• Ready for installation

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What's Included

Your purchase includes:

• Mercury 15-Inch Lower Unit Assembly

Only the components shown in the product photos are included.

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Shipping Information

Every lower unit is securely packaged to prevent damage during transit. We offer fast shipping throughout the United States, with international shipping available upon request. For an accurate shipping quote, please provide:

• Country
• ZIP or Postal Code
• Commercial or Residential Address
• Whether liftgate service is required

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Warranty

This Mercury lower unit is backed by a 1-Year Working Warranty. If a covered mechanical failure occurs during normal use within the warranty period, EZ Boats Marine will repair, replace, or refund the unit in accordance with our warranty policy.

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Why Buy from EZ Boats Marine?

• Quality Replacement Mercury Lower Units
• Professionally Inspected Before Shipment
• Pressure Tested for Reliable Performance
• New Water Pump Impeller Installed
• Ready to Install
• Secure Packaging
• Fast Nationwide and International Shipping
• 1-Year Working Warranty
• Experienced Marine Customer Support

EZ Boats Marine is committed to supplying premium marine parts backed by dependable service, expert support, and honest product descriptions.

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Frequently Asked Questions

Which Mercury outboards does this lower unit fit?

This lower unit fits select 1962–1972 Mercury 90HP, 100HP, and 115HP outboards equipped with a 15-inch shaft and 2.33:1 gear ratio.

Has this lower unit been inspected?

Yes. Every unit is professionally inspected, pressure tested, and fitted with a new water pump impeller before shipment.

Is gear oil included?

No. The lower unit ships without gear oil. Fill it with the appropriate marine gear lubricant before operation.

Is this lower unit ready to install?

Yes. It is professionally prepared and ready for installation on a compatible Mercury outboard.

Does it include a warranty?

Yes. This lower unit is backed by a 1-Year Working Warranty for added peace of mind.