Mercury 6 Jaw Lower Unit | 2.31:1 Gear Ratio | Fits 1998 & Newer Mercury 75HP, 80HP, 85HP & 90HP Outboards | 1-Year Warranty

Product Overview

Restore dependable performance to your Mercury outboard with this genuine Mercury 6 Jaw Lower Unit, designed for select 1998 and newer Mercury 75HP, 80HP, 85HP, and 90HP outboard engines. Featuring the 6 Jaw clutch system and a 2.31:1 gear ratio, this professionally serviced lower unit delivers smooth shifting, reliable power transfer, and long-lasting durability. Every lower unit is carefully inspected, fully resealed, pressure tested, and fitted with a new water pump impeller before shipment. Internal components are inspected under magnification, and OEM gears are retained whenever they meet Mercury's factory specifications, ensuring dependable operation while maintaining genuine Mercury quality. Ready for installation, this lower unit is backed by a 1-Year Warranty, making it an excellent replacement for damaged or worn gearcases.

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Key Features

• Genuine OEM Mercury Lower Unit
• 6 Jaw Clutch Design
• Fits Mercury 75HP, 80HP, 85HP & 90HP Outboards
• 2.31:1 Gear Ratio
• Professionally Inspected
• Fully Resealed
• Pressure Tested
• New Water Pump Impeller Installed
• Internal Components Inspected Under Magnification
• OEM Gears Retained When Within Specification
• Ready for Installation
• 1-Year Warranty Included

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Technical Specifications

Specification	Details
Brand	Mercury
Product Type	Lower Unit
Condition	Professionally Serviced
Gear Ratio	2.31:1
Clutch System	6 Jaw
Horsepower	75 HP / 80 HP / 85 HP / 90 HP
Model Years	1998 and Newer
Driveshaft Length	20-1/4 Inches
Driveshaft Splines	13
Prop Shaft Splines	15

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

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Compatible Applications

Designed for select Mercury outboard engines including: Model Years

• 1998 and Newer

Horsepower

• 75 HP
• 80 HP
• 85 HP
• 90 HP

Gear Ratio

• 2.31:1

Clutch Style

• 6 Jaw

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

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Condition

This lower unit has been professionally serviced and thoroughly inspected before being offered for sale. Service and inspection include:

• Complete reseal
• Pressure tested to ensure leak-free performance
• New water pump impeller installed
• Internal components inspected under magnification
• OEM gears retained when they meet factory specifications
• Ready for installation

Please Note: Gear oil is not included and must be added before operating the lower unit.

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What's Included

Your purchase includes:

• Mercury 6 Jaw Lower Unit Assembly
• New Water Pump Impeller
• Professionally Resealed and Pressure-Tested Gearcase

Only the components shown in the product photos are included.

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Shipping Information

Every lower unit is securely packaged to protect it during shipping. 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 6 Jaw Lower Unit is backed by a 1-Year Warranty. If the lower unit experiences a covered failure during normal operation within the warranty period, EZ Boats Marine will repair, replace, or refund the item if a replacement is unavailable, in accordance with our warranty policy.

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Why Buy from EZ Boats Marine?

• Genuine OEM Mercury Marine Parts
• Professionally Serviced Lower Units
• Fully Resealed and Pressure Tested
• New Water Pump Impeller Installed
• OEM Internal Components
• 1-Year Warranty Included
• Secure Packaging
• Fast Nationwide and International Shipping
• Experienced Marine Customer Support
• Trusted Source for Outboard Motors and Marine Parts

EZ Boats Marine is committed to supplying premium OEM marine components backed by dependable service, expert support, and reliable performance.

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Frequently Asked Questions

Which Mercury outboards does this lower unit fit?

This lower unit fits select 1998 and newer Mercury 75HP, 80HP, 85HP, and 90HP outboards equipped with the 6 Jaw clutch system and 2.31:1 gear ratio. Always verify your engine's model number, serial number, and OEM specifications before ordering.

What is a 6 Jaw lower unit?

A 6 Jaw lower unit uses Mercury's six-dog clutch design to provide positive gear engagement and reliable shifting. It is important to match your replacement lower unit to your engine's clutch style for proper compatibility.

Has this lower unit been serviced?

Yes. It has been professionally inspected, fully resealed, pressure tested, and fitted with a new water pump impeller before being offered for sale.

Is gear oil included?

No. Gear lubricant is not included and should be added before operating the lower unit.

Does this lower unit include a warranty?

Yes. This Mercury 6 Jaw Lower Unit is backed by a 1-Year Warranty, providing added confidence and peace of mind with your purchase.