Mercury Bigfoot Lower Unit | 2.42:1 Gear Ratio | Fits 1998–2006 Mercury Bigfoot 8HP, 9.9HP, 13.5HP & 15HP 4-Stroke Outboards | 1-Year Warranty

Product Overview

Restore dependable performance to your Mercury outboard with this genuine Mercury Bigfoot Lower Unit, designed for select 1998–2006 Mercury Bigfoot 4-stroke outboard engines. Featuring a 2.42:1 gear ratio, this professionally serviced lower unit is compatible with 8HP, 9.9HP, 13.5HP, and 15HP Bigfoot models, making it an excellent replacement for worn or damaged gearcases. Each lower unit is completely disassembled, professionally inspected, fully resealed, and pressure tested to ensure reliable performance. A new water pump impeller is installed during servicing, while internal components are carefully inspected under magnification. OEM gears are retained whenever they meet Mercury factory specifications, ensuring smooth shifting and long-lasting durability. Ready for installation and backed by a 1-Year Warranty, this lower unit provides dependable OEM performance for your next repair or restoration project.

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Key Features

• Genuine OEM Mercury Bigfoot Lower Unit
• Fits Mercury Bigfoot 4-Stroke Outboards
• Compatible with 8HP, 9.9HP, 13.5HP & 15HP Models
• 2.42:1 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
Engine Compatibility	Mercury Bigfoot 4-Stroke
Gear Ratio	2.42:1
Horsepower	8 HP / 9.9 HP / 13.5 HP / 15 HP
Model Years	1998–2006
Driveshaft Length	19-1/2 Inches
Driveshaft Splines	11
Prop Shaft Splines	10

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 Bigfoot outboard engines including: Model Years

• 1998
• 1999
• 2000
• 2001
• 2002
• 2003
• 2004
• 2005
• 2006

Horsepower

• 8 HP
• 9.9 HP
• 13.5 HP
• 15 HP

Engine Type

• 4-Stroke Bigfoot

Gear Ratio

• 2.42:1

Important: Always verify your engine's model number, serial number, shaft length, 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 internal inspection under magnification
• Fully resealed
• Pressure tested to 12 PSI for leak-free performance
• New water pump impeller installed
• 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 Bigfoot Lower Unit Assembly
• New Water Pump Impeller
• Professionally Serviced 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 Bigfoot 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
• Competitive Pricing
• Experienced Marine Customer Support

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 1998–2006 Mercury Bigfoot 4-stroke outboards rated at 8HP, 9.9HP, 13.5HP, and 15HP. Always verify your engine's model number, serial number, and OEM specifications before ordering.

What gear ratio does this lower unit have?

This lower unit features a 2.42:1 gear ratio, providing factory-correct performance for compatible Mercury Bigfoot outboards.

Has this lower unit been professionally serviced?

Yes. It has been fully resealed, pressure tested to 12 PSI, fitted with a new water pump impeller, and internally inspected under magnification before being offered for sale.

Is gear oil included?

No. Gear lubricant is not included and must be added before the lower unit is placed into service.

Does this lower unit include a warranty?

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