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

Product Overview

Restore reliable performance to your Mercury outboard with this genuine Mercury Bigfoot Lower Unit, designed for select 1998–2006 Mercury Bigfoot 4-stroke outboard engines. Compatible with 8HP, 9.9HP, 13.5HP, and 15HP models, this professionally serviced lower unit is an excellent replacement for worn or damaged gearcases. Every lower unit is carefully disassembled, inspected, pressure tested, and serviced to ensure dependable operation. A new water pump impeller is installed during servicing, while internal components are inspected under magnification to verify proper condition. OEM gears are retained whenever they meet Mercury factory specifications, ensuring reliable shifting and long-lasting performance. The housing has been professionally stripped and primed, leaving it ready for paint or installation. Backed by a 1-Year Warranty, this lower unit is ready to help get your Mercury Bigfoot back on the water.

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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
• Professionally Inspected
• Pressure Tested
• New Water Pump Impeller Installed
• Smooth Shift Operation Verified
• Internal Components Inspected Under Magnification
• Housing Stripped and Primed
• Ready for Paint or 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
Horsepower	8 HP / 9.9 HP / 13.5 HP / 15 HP
Model Years	1998–2006
Driveshaft Length	19-7/16 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

Important: Always verify your engine's model number, serial number, shaft length, 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
• Pressure tested for leak-free performance
• New water pump impeller installed
• Shift operation tested and verified
• OEM gears retained when they meet factory specifications
• Housing professionally stripped and primed
• Ready for paint or 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 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
• Pressure Tested for Leak-Free Performance
• New Water Pump Impeller Installed
• Smooth Shift Operation Verified
• Housing Professionally Stripped and Primed
• 1-Year Warranty Included
• Secure Packaging
• Fast Nationwide and International Shipping
• 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.

Has this lower unit been professionally serviced?

Yes. It has been inspected, pressure tested, fitted with a new water pump impeller, and the shift mechanism has been tested to ensure reliable operation.

Is the housing painted?

The housing has been professionally stripped and primed, allowing you to apply your preferred finish or install it as part of your restoration project.

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.