Best Extension Housing Seals

Looking for the best extension housing seals to keep your transmission leak-free? We’ve curated a list of the top 10 high-quality seals designed for durability and easy installation, perfect for both DIY enthusiasts and professional mechanics.

Extension housing seals are crucial for keeping your transmission leak-free and running smoothly. A reliable seal ensures your vehicle performs at its best, saving you time and money on repairs. We’ve gathered the top options to help you find the perfect fit for your needs.

Discover high-quality seals designed for durability and easy installation. Whether you’re a DIY enthusiast or a professional mechanic, this guide will help you make the right choice with confidence.

List of Top 10 Extension Housing Seals

Title	Best For	Price
ATP automotive CO-36 Automatic Transmission Extension Housing Seal	This ATP CO-36 seal is perfect for car owners who need a reliable replacement part. It’s easy to install and meets high standards, making it ideal for anyone fixing their automatic transmission.	View on Amazon (paid link)
FBSCTMH TH350 TH350C Transmission Extension Housing Reseal Kit with Bushing with THM250, 250C, 350, 350C, 375B Rear Bushing, Seal & O-Ring Kit	This kit is perfect for DIY car owners and auto repair pros who want a fast, clean fix. It helps anyone who needs a simple, strong way to stop leaks and keep their transmission running smooth.	View on Amazon (paid link)
TH350 and 700R4 Rear Seal for Extension Tail Housing	This rear seal is perfect for anyone fixing a TH350 or 700R4 transmission. It fits 1969 and newer TH350s and 1983 and newer 700R4s.	View on Amazon (paid link)
GM Genuine Parts 24241496 Automatic Transmission Case Rear Extension with Seal	This GM Genuine Parts transmission case is perfect for GM owners who want a reliable replacement. It’s made in the USA and fits just right, so your car runs smoothly.	View on Amazon (paid link)
National 224464 Auto Trans Ext. Housing Seal	This seal is perfect for anyone fixing automatic transmissions. It works well in hot or cold weather and with most oils.	View on Amazon (paid link)
GM Genuine Parts 24226788 Automatic Transmission Case Rear Extension with Seal	This GM Genuine Parts 24226788 Automatic Transmission Case Rear Extension with Seal is perfect for GM vehicle owners who want a reliable replacement part. It’s made to fit perfectly and last long, just like the original factory component.	View on Amazon (paid link)
4R70W 4R75 Transmission Rear Housing Gasket – Bushing – Seal kit fits 1993-08	This 4R70W 4R75 Transmission Rear Housing Gasket – Bushing – Seal kit is perfect for anyone with a 1993-2008 Ford, Lincoln, or Mercury vehicle needing a reliable, OEM-quality replacement. It’s easy to install and ensures optimal sealing performance.	View on Amazon (paid link)
National 711016 Automatic Transmission Extension Housing Seal	This seal is perfect for anyone fixing an automatic transmission. It works well in all weather and lasts a long time.	View on Amazon (paid link)
RongJYAutoParts Automatic Transmission Extension Housing Seal for INFINITI Q70, QX80 2014 2015 5.6L V8, Automotive Replacement Parts	This is perfect for INFINITI owners who want a simple, fast, and direct-fit fix for their transmission seal. It’s great for anyone who needs a clean, easy swap with no extra work.	View on Amazon (paid link)
Automatic Transmission Extension Housing Oil Seal for Toyota 4Runner FJ Tacoma for Lexus IS350 GS350 90311-40001	This Automatic Transmission Extension Housing Oil Seal is perfect for Toyota and Lexus owners who need a reliable replacement part. It’s easy to install and built to last, making it ideal for anyone looking to keep their vehicle running smoothly.	View on Amazon (paid link)

Detailed Reviews

Find the best Extension Housing Seals with a guide you can trust. Each pick is chosen for real performance, true value, and easy installation. You’ll feel confident and ready to explore the full list.

1. ATP automotive CO-36 Automatic Transmission Extension Housing Seal

The ATP CO-36 Seal gives your transmission a tight, clean fit. It is built to match original equipment standards with ease.

It is light. It is small. It works fast.

Pros	Cons
Meets or exceeds original equipment specs. Lightweight at just 0.05 pounds. Compact size for easy storage. Exact fit with part number CO-36.	Not a DIY fix, needs expert skills. Small size may lead to easy loss. Limited use, specific to certain transmissions.

Perfect For:

This ATP CO-36 seal is perfect for car owners who need a reliable replacement part. It’s easy to install and meets high standards, making it ideal for anyone fixing their automatic transmission.

Ready to Purchase?

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2. FBSCTMH TH350 TH350C Transmission Extension Housing Reseal Kit with Bushing with THM250, 250C, 350, 350C, 375B Rear Bushing, Seal & O-Ring Kit

The FBSCTMH TH350 Transmission Extension Housing Reseal Kit is a must-have for anyone working on their transmission. It’s designed to fit multiple models, making it versatile and practical.

This kit prevents leaks and extends transmission life. It includes high-quality seals, bushings, and O-rings for a complete repair.

Installation is simple and straightforward. The parts are exact factory replacements, so no guesswork is needed. Save time and effort with this all-in-one solution.

Pros	Cons
Fits many models for a perfect match every time. Stops messy leaks to keep your car clean. Full kit has all parts you need to finish. Easy to install and saves you lots of time. High quality parts make your transmission last much longer.	May not fit all custom builds Basic kit with no extra parts Needs skill for smooth install

Perfect For:

This kit is perfect for DIY car owners and auto repair pros who want a fast, clean fix. It helps anyone who needs a simple, strong way to stop leaks and keep their transmission running smooth.

Ready to Purchase?

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3. TH350 and 700R4 Rear Seal for Extension Tail Housing

The CT7888 is a rear seal for TH350 and 700R4 transmissions. It fits extension tail housings on these models. This seal is made in the USA.

It works with TH350 transmissions from 1969 and up. It also fits 700R4 transmissions from 1983 and up. This seal is a direct replacement for worn or damaged parts.

The CT7888 is easy to install. It helps prevent leaks in your transmission. Keep your vehicle running smoothly with this quality seal.

Pros	Cons
Made in USA for top quality. Fits TH350 units from 1969 and up. Works for 700R4 units from 1983 and up. Stops leaks at the tail housing fast. Easy to install in your rear housing.	Limited compatibility with older transmissions. No installation tools or instructions included. Single-use seal; replacement needed if damaged.

Perfect For:

This rear seal is perfect for anyone fixing a TH350 or 700R4 transmission. It fits 1969 and newer TH350s and 1983 and newer 700R4s.

Ready to Purchase?

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4. GM Genuine Parts 24241496 Automatic Transmission Case Rear Extension with Seal

The GM Genuine Parts 24241496 is a reliable replacement for your vehicle’s transmission case rear extension. It comes with a seal included for easy installation. This part is made in the United States.

It meets GM’s high standards for fit and function. The part is built to last, ensuring durability and performance.

This is the recommended choice for GM vehicles. It offers quality and reliability you can trust.

Pros	Cons
GM Genuine Parts ensure perfect fit and function. Made in the USA with top quality and durability. Reliable replacement for your GM vehicle’s original part. Meets GM standards for long-lasting performance.	Limited to GM vehicles, not universal. Higher cost compared to aftermarket options. No DIY-friendly installation, professional help needed.

Perfect For:

This GM Genuine Parts transmission case is perfect for GM owners who want a reliable replacement. It’s made in the USA and fits just right, so your car runs smoothly.

Ready to Purchase?

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5. National 224464 Auto Trans Ext. Housing Seal

The National 224464 Auto Trans Ext. Housing Seal is a spring-loaded, multi-lip seal designed for reliable performance. It works in extreme temperatures, from -20°F to 300°F. This seal is compatible with most oils and EP lubricants, making it a versatile choice for repairs.

It’s made from polyacrylate material, which resists oxidation and ozone. This ensures long-lasting durability in tough conditions. The seal also has low swell in hydrocarbon fluids, keeping it stable and effective.

This product delivers quality and reliability for every repair. Its high resistance to wear and tear makes it a trusted solution for auto transmissions. Choose this seal for consistent performance in any repair job.

Pros	Cons
Handles heat with ease Resists wear for long life Keeps leaks under control Works well with many oils Built strong for tough use	Limited to specific temperature range. May not fit all transmission models. Polyacrylate material not ideal for extreme conditions.

Perfect For:

This seal is perfect for anyone fixing automatic transmissions. It works well in hot or cold weather and with most oils.

Ready to Purchase?

View Price on Amazon (paid link)

6. GM Genuine Parts 24226788 Automatic Transmission Case Rear Extension with Seal

GM Genuine Parts 24226788 is a reliable replacement for your vehicle’s transmission case rear extension. It’s designed to fit perfectly and work like the original.

This part is made to GM’s high standards, ensuring quality and durability. It’s built to last and perform well.

Manufactured in Canada, it meets GM’s strict specifications. Easy to install, it comes with a seal included.

Pros	Cons
GM Genuine Parts ensure perfect fit and function. Built to last with quality and durability. Manufactured in Canada for trusted reliability. Exact replacement for your GM vehicle’s original part.	Limited to GM vehicles, not universal. Higher cost than aftermarket options. No DIY-friendly installation, professional help needed.

Perfect For:

This GM Genuine Parts 24226788 Automatic Transmission Case Rear Extension with Seal is perfect for GM vehicle owners who want a reliable replacement part. It’s made to fit perfectly and last long, just like the original factory component.

Ready to Purchase?

View Price on Amazon (paid link)

7. 4R70W 4R75 Transmission Rear Housing Gasket – Bushing – Seal kit fits 1993-08

Fix your transmission with this 4R70W 4R75 Rear Housing Kit. It’s a perfect fit for 1993-2008 models.

This kit includes three key parts: a gasket, a bronze bushing, and a metal seal. They work together for smooth performance.

Made with OEM-quality materials, this kit ensures reliable sealing and long-lasting use. It’s easy to install and built to last.

Pros	Cons
Perfect fit for 1993-2008 Ford, Lincoln, Mercury vehicles. OEM-quality ensures reliable sealing and durability. Complete kit includes gasket, bushing, and seal for easy repair. Seamless replacement saves time and prevents leaks.	Not universal: Only fits specific Ford, Lincoln, Mercury models. Limited use: No extra parts for other transmission repairs. Professional install: May need expert help for proper fit.

Perfect For:

This 4R70W 4R75 Transmission Rear Housing Gasket – Bushing – Seal kit is perfect for anyone with a 1993-2008 Ford, Lincoln, or Mercury vehicle needing a reliable, OEM-quality replacement. It’s easy to install and ensures optimal sealing performance.

Ready to Purchase?

View Price on Amazon (paid link)

8. National 711016 Automatic Transmission Extension Housing Seal

The National 711016 Automatic Transmission Extension Housing Seal is a reliable and high-quality solution for your vehicle. It’s spring loaded and multi-lip for a secure fit. This seal is built to last in any condition.

It works in extreme temperatures, from -30°F to 325°F. It offers superior thermal protection. It handles abrasion and dry running well.

This seal delivers quality performance for every repair. It’s easy to install and trustworthy. Choose this seal for lasting results.

Pros	Cons
Spring-loaded, multi-lip design ensures a tight seal every time. Handles extreme temps from -30°F to 325°F with ease. Superior thermal protection keeps your transmission running smoothly. Resists wear and dry running for long-lasting performance.	Not for manual transmissions, only automatic. Limited to specific temperature range, may not suit all climates. Requires professional installation, not DIY-friendly.

Perfect For:

This seal is perfect for anyone fixing an automatic transmission. It works well in all weather and lasts a long time.

Ready to Purchase?

View Price on Amazon (paid link)

9. RongJYAutoParts Automatic Transmission Extension Housing Seal for INFINITI Q70, QX80 2014 2015 5.6L V8, Automotive Replacement Parts

This seal stops leaks. It fits your car well. Keep your drive smooth.

The part is very strong. It stays tough and safe. You can fix it fast.

Get the best fit. Save your new oil.

Pros	Cons
Perfect fit for INFINITI Q70, QX80 2014-2015 5.6L V8. Direct replacement, easy to install in one simple step. Durable seal ensures reliable transmission performance. Vehicle-specific design guarantees compatibility and precision.	Limited vehicle compatibility, only fits specific INFINITI models. Single-part package, no extras or tools included. No warranty or return policy details provided.

Perfect For:

This is perfect for INFINITI owners who want a simple, fast, and direct-fit fix for their transmission seal. It’s great for anyone who needs a clean, easy swap with no extra work.

Ready to Purchase?

View Price on Amazon (paid link)

10. Automatic Transmission Extension Housing Oil Seal for Toyota 4Runner FJ Tacoma for Lexus IS350 GS350 90311-40001

Keep your vehicle running smoothly with the Automatic Transmission Extension Housing Oil Seal. Designed for Toyota and Lexus models, it ensures a perfect fit and easy installation. Made from durable materials, it’s built to last.

This oil seal is heat-resistant and corrosion-resistant, offering strong protection against wear and tear. It’s compatible with popular models like the 4Runner, Tacoma, and Lexus IS350. Each package includes one seal, as shown in the photos.

Check the photos carefully to ensure it matches your needs. With OE numbers like 90311-40001, it’s a reliable replacement for your vehicle.

Pros	Cons
Fits many Toyota and Lexus models for easy installation. Durable metal and rubber resist heat and corrosion. Long-lasting with strong anti-aging and compression resistance. Exact match for OE numbers, ensuring perfect fit.	Limited to specific Toyota and Lexus models only. Single seal included, no extra parts or tools provided. Careful inspection needed to ensure correct fit.

Perfect For:

This Automatic Transmission Extension Housing Oil Seal is perfect for Toyota and Lexus owners who need a reliable replacement part. It’s easy to install and built to last, making it ideal for anyone looking to keep their vehicle running smoothly.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Extension housing seals keep your transmission leak-free and running smoothly. A reliable seal saves you time and money on repairs. We’ve gathered the top options to help you find the perfect fit.

Choosing the right seal can feel overwhelming, but we’re here to help. Whether you’re a DIY enthusiast or a professional mechanic, this guide makes it easy. Discover high-quality seals designed for durability and easy installation.

Here’s what to consider when buying:

Compatibility: Make sure the seal fits your vehicle’s make and model. Check the part number or OE number for a perfect match.
Material Quality: Look for seals made from durable materials like polyacrylate or OEM-quality components. They last longer and perform better.
Temperature Resistance: Choose a seal that works in extreme temperatures if you drive in harsh conditions.
Ease of Installation: Opt for seals with simple installation processes, especially if you’re doing it yourself.
Brand Reputation: Go for trusted brands like GM Genuine Parts or National for reliable performance.
Kit Options: Consider reseal kits that include bushings, O-rings, and gaskets for a complete repair.
Price and Value: Balance cost with quality to get the best value for your money.

With these tips, you’ll find the perfect extension housing seal for your needs. Drive with confidence and keep your transmission in top shape!