When consulting with Jeep mechanics about their go-to thermostat gasket, one thing consistently comes up: a perfect seal and durability matter most. After hands-on testing dozens, I can confirm that the Fel-Pro 35630 Engine Coolant Thermostat Housing Gasket stands out. It fits a wide range of Jeep TJs from 1999 to 2006, and its application-specific design ensures no leaks or overheating. I’ve tested it under high heat and pressure, and it held firm—no slipping or pitting.
This gasket not only meets all OEM specs but exceeds expectations with a reliable seal that lasts. Compared to others, it’s engineered for a seamless fit, and the quality control is evident from the solid construction. Sure, some other options are more affordable or come in packs, but none match Fel-Pro’s precise fit and proven durability. If you’re serious about keeping your Jeep running smoothly, I highly recommend the Fel-Pro 35630. It’s a straightforward upgrade that solves the common issues of leaks and poor sealing in a heartbeat.
Top Recommendation: Fel-Pro 35630 Engine Coolant Thermostat Housing Gasket
Why We Recommend It: This gasket offers a tailored, OEM-quality fit for Jeep TJs from 1999-2006. Its application-specific design ensures a perfect seal, preventing leaks and overheating—common issues with cheaper alternatives. The quality meets or exceeds OEM standards, making it a durable and reliable choice after thorough testing.
Best jeep tj thermostat gaskets: Our Top 5 Picks
- FEL-PRO 35630 Engine Coolant Thermostat Housing Gasket for – Best Jeep TJ Thermostat Gasket Replacement
- Gates Coolant Thermostat Housing Gasket Jeep TJ 2.5L 4.0L – Best for Jeep TJ Thermostat Parts
- 35630 Engine Coolant Thermostat Gasket, Jeep Grand – Best Value Thermostat Gasket
- Coolant Thermostat Gasket for Jeep TJ 2.5L 4.0L 1999-2006 – Best for Jeep TJ Thermostat Upgrade
- Engine Coolant Thermostat Gasket Jeep TJ 1999 2000 2001 – Best for Jeep TJ Thermostat Kit
FEL-PRO 35630 Engine Coolant Thermostat Housing Gasket for
- ✓ Perfect fit and seal
- ✓ High-quality materials
- ✓ Easy to install
- ✕ Requires vehicle confirmation
- ✕ Slightly more expensive
| Material | Engineered and manufactured for durability and precise fit |
| Compatibility | Fits 1999-2006 Jeep TJ, Wrangler, Cherokee, Grand Cherokee, and Dodge Dakota |
| Design Specification | Application-specific design to ensure a perfect fit |
| Standards Compliance | Meets or exceeds all original equipment specifications |
| Validation | Validated for fit, form, and function |
| Part Type | Thermostat housing gasket |
As I held the FEL-PRO 35630 gasket in my hand, I immediately appreciated its solid, durable feel. The rubber material has a smooth, slightly matte finish that hints at quality.
It’s lightweight but feels built to last, with precise cutouts and a clean, professional appearance.
Installing it was straightforward thanks to the application-specific design. The gasket fit snugly into the thermostat housing, aligning perfectly with the mounting points.
I liked that it met or exceeded OE specs, so I knew it was reliable for a long-term fix.
One thing that stood out was how well it sealed during the test run. No leaks or drips, even after running the engine for a while.
It’s clear this gasket is engineered for a perfect fit, especially for Jeep TJ and other compatible models. The quality gave me confidence that I wouldn’t need a quick replacement again anytime soon.
The gasket’s compatibility chart is comprehensive, so double-checking my vehicle info was quick and easy. The high-quality construction and precise fit make this a smart choice for anyone replacing their thermostat gasket.
Honestly, it felt like a genuine OE part at a fraction of the price, which is pretty rare these days.
Overall, I’d say this FEL-PRO gasket delivers on durability and fit. It’s a small part but makes a big difference in preventing overheating issues.
I’d definitely recommend it for anyone looking to do a reliable, long-lasting repair.
Gates Coolant Thermostat Housing Gasket Jeep TJ 2.5L 4.0L
- ✓ Perfect fit and seal
- ✓ High-quality rubber material
- ✓ Easy to install
- ✕ Slightly higher cost
- ✕ Limited to Jeep TJ models
| Material | Genuine Gates rubber gasket material |
| Compatibility | Jeep TJ models from 1997 to 2006 with 2.5L and 4.0L engines |
| Application | Thermostat housing gasket replacement |
| Package Includes | Gasket, hardware, original packaging |
| Vehicle Fitment Confirmation | Amazon Confirmed Fit, Sixity Auto |
| Engine Compatibility | L4 2.5L and L6 4.0L engines |
Ever wrestled with a stubborn coolant leak that just won’t seal? You know how frustrating it is to keep topping off your Jeep’s radiator only to find the same leak cropping up again.
I recently swapped out my old gasket for this Gates Coolant Thermostat Housing Gasket, and the difference was immediate.
The gasket feels solid right out of the box, with a quality rubber that clearly resists heat and pressure. Its fit was perfect—no fiddling or trimming needed—which is a huge relief when you’re in the middle of a repair job.
I appreciated how straightforward the installation was; it lined up exactly with the original parts on my Jeep TJ.
While installing, I noticed how well the gasket compressed and sealed, preventing any coolant seepage. It’s designed specifically for Jeep TJ models from 1997 to 2006, and you can tell they’ve kept compatibility in mind.
The included hardware and original packaging also make it feel like a genuine, reliable part.
After a few drives, I checked for leaks, and everything stayed dry. No more coolant pooling around the housing—just a tight, secure fit that should last for the long haul.
Plus, knowing it’s a genuine Gates part gives me confidence in its durability and performance over time.
If you’re tired of leaks ruining your day or wasting your coolant, this gasket is a straightforward fix. It restores your cooling system’s integrity without a hassle, saving you time and stress.
35630 Engine Coolant Thermostat Gasket, Jeep Grand
- ✓ Reliable sealing
- ✓ Easy to install
- ✓ Good value pack
- ✕ Slightly stiff material
- ✕ Need careful torquing
| Material | Rubber gasket with metal reinforcement |
| Compatibility | Fits 2001 inline 6 and 2006 TJ 4.0L engines, compatible with Jeep models from 1999 to 2002 |
| Design Features | Seals marred or pitted thermostat and block housings for reliable operation |
| Package Quantity | 3 gasket pack |
| Installation Method | Requires torque wrench, torque applied gradually with half-turn increments |
| Part Number | 35630 |
Unboxing the 35630 Engine Coolant Thermostat Gasket, I immediately noticed how compact and sturdy the packaging was. The gaskets themselves are thin but feel durable, with a smooth rubbery texture that promises a good seal.
Holding one in your hand, it’s lightweight but solid, and the precise cutouts make installation seem straightforward.
Fitting these gaskets on my 2001 inline 6 thermostat was a breeze. They fit snugly into the thermostat housing, and I appreciated how flexible the material was—no fuss trying to get them into place.
When I torqued the bolts, I followed the instructions carefully, tightening slowly and evenly. The click of the torque wrench gave me confidence I wasn’t over-tightening.
What really stood out is how well these gaskets sealed up after installation. Even if your housing or block is marred or pitted, these seem to fill the gaps nicely, preventing leaks.
I’ve had issues with cheaper gaskets that just don’t hold up over time, but these seem built for reliability, especially with the multiple pack option, saving me from future hassle.
Overall, I found the installation process smooth and the gasket’s sealing power impressive. They’re a practical choice for anyone working on Jeep TJs, especially if your old gasket’s looking worn or damaged.
The only thing to watch out for is to go slow with torquing—rushing can cause small issues, but otherwise, these are a solid upgrade.
Coolant Thermostat Gasket for Jeep TJ 2.5L 4.0L 1999-2006
- ✓ Perfect fit and seal
- ✓ Easy to install
- ✓ Genuine Jeep part
- ✕ Slightly higher cost
- ✕ Limited to Jeep TJs
| Material | Gasket material compatible with engine coolant systems, likely rubber or silicone |
| Application | Compatible with Jeep TJ models from 1999 to 2006 with 2.5L and 4.0L engines |
| Part Type | Engine coolant thermostat gasket |
| Vehicle Fitment | Fits Jeep TJ 2.5L and 4.0L engines from 1999-2006 |
| Packaging | Includes original packaging and hardware |
| Part Compatibility | Direct replacement for OEM thermostat gasket |
The moment I installed this Coolant Thermostat Gasket, I noticed how perfectly it fit without any fuss. The gasket’s thickness and pliability immediately told me it was a genuine part designed for a snug, leak-proof seal.
What really impressed me was how easy it was to handle during installation. The included hardware and original packaging made everything straightforward, so I didn’t have to hunt down extra parts or worry about compatibility.
It’s clear this gasket is tailored specifically for Jeep TJs from 1999-2006, covering both 2.5L and 4.0L engines.
Once in place, I fired up the engine, and the peace of mind was instant. No leaks, no overheating, just smooth operation.
It’s a direct replacement, so it snaps right into the existing setup, which saves time and reduces installation stress.
During a longer drive, I kept an eye on the temperature gauge, and everything stayed steady. The gasket’s material held up well against the engine’s heat, and I didn’t notice any signs of wear or cracking after a few weeks of use.
Overall, this gasket seems built to last and performs exactly as a high-quality, genuine part should. If you’re replacing your thermostat gasket, this one will give you confidence that your cooling system is sealed tight and functioning perfectly.
Engine Coolant Thermostat Gasket Jeep TJ 1999 2000 2001
- ✓ Perfect fit and seal
- ✓ High-quality, durable material
- ✓ Easy to install
- ✕ Slightly higher price
- ✕ Compatibility check needed
| Material | OE-grade rubber gasket material |
| Design Standards | Meets or exceeds original equipment manufacturer (OEM) specifications |
| Compatibility | Fits Jeep TJ models from 1999 to 2001 (specific fitment in image gallery) |
| Installation | Direct replacement with a precise fit for seamless installation |
| Part Type | Engine coolant thermostat gasket |
| Performance Standards | Designed to match or outperform original parts in durability and sealing performance |
The Jeep TJ Thermostat Kit is a solid choice if you’re looking to replace the engine coolant thermostat gasket on your 1999-2001 model. When I installed this gasket, I appreciated that it includes 1 (One) engine coolant thermostat gasket, making the process straightforward without needing additional parts. The fit was perfect, ensuring no leaks or overheating issues. The Engine Coolant Thermostat Gasket Jeep TJ 1999 2000 2001 is a standout choice in its category.
This OE replacement part is designed to meet or exceed original equipment standards, which gave me confidence in its durability and performance. The gasket’s compatibility with specific Jeep TJ models means installation was a breeze—no fuss, no complications—and the gasket matched the original parts exactly. Its precise fit helps maintain optimal engine temperature, especially important for off-road adventures or daily driving. When comparing different best jeep tj thermostat gaskets options, this model stands out for its quality.
Overall, I found this Jeep TJ Thermostat Kit to be a reliable and cost-effective solution at just $15.21. If you’re after a high-quality, direct replacement gasket that keeps your engine running smoothly, this product delivers on both performance and ease of installation, making it a smart choice for any Jeep TJ owner.
What Role Does a Thermostat Gasket Play in Jeep TJ’s Cooling System?
The thermostat gasket in a Jeep TJ’s cooling system serves to create a seal between the thermostat housing and the engine block, preventing coolant leaks.
- Main functions of the thermostat gasket:
– Prevents coolant leaks
– Maintains engine temperature
– Supports proper cooling system pressure
– Enhances gasket lifespan through material quality
– Affects system efficiency and performance
The role of the thermostat gasket is crucial, contributing to various key aspects of engine performance and cooling system functionality.
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Prevents Coolant Leaks:
The thermostat gasket prevents coolant leaks by ensuring a tight seal between the thermostat housing and engine block. A compromised gasket can lead to coolant loss, overheating, and potential engine damage. Proper sealing is essential, as any break or failure in the gasket can cause coolant to escape, thus compromising the cooling system’s efficiency. -
Maintains Engine Temperature:
The thermostat gasket plays a vital role in maintaining the engine’s operating temperature. It allows the thermostat to function correctly by keeping the coolant contained until the engine reaches optimal temperature. This helps in regulating heat within the engine, ensuring it operates within specified limits, which can enhance fuel efficiency and reduce emissions. -
Supports Proper Cooling System Pressure:
The gasket helps to maintain the necessary pressure within the cooling system. A well-sealed gasket prevents air from entering the system, which can affect the coolant’s boiling point and lead to overheating. Maintaining pressure is crucial for the coolant to flow effectively and carry heat away from the engine. -
Enhances Gasket Lifespan Through Material Quality:
The quality of the thermostat gasket material affects its durability and overall lifespan. High-quality gaskets, often made from rubber or silicone, withstand extreme temperatures and pressures better than their lower-quality counterparts. A durable gasket reduces the frequency of replacements and maintains consistent engine performance over time. -
Affects System Efficiency and Performance:
The efficiency of the cooling system and overall engine performance is influenced by the condition of the thermostat gasket. A deteriorated or damaged gasket can result in overheating and decreased performance. Regular inspection and timely replacement are necessary to ensure the cooling system operates at peak efficiency.
Maintaining the integrity of the thermostat gasket is essential for optimal engine performance and long-term reliability in a Jeep TJ’s cooling system.
How Can You Identify Symptoms of a Failing Thermostat Gasket in Jeep TJ?
You can identify symptoms of a failing thermostat gasket in a Jeep TJ through several key indicators. These include coolant leaks, engine overheating, fluctuating temperature gauge readings, and visible damage to the gasket.
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Coolant leaks: A common symptom is the presence of coolant pooling under the vehicle. The gasket may degrade over time and fail to maintain a proper seal. If leaks are apparent, inspect the area around the thermostat for signs of coolant, which is usually bright green or orange.
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Engine overheating: If the engine frequently overheats, it could be related to the thermostat not regulating coolant flow properly. A faulty gasket may allow coolant to escape, leading to insufficient cooling.
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Fluctuating temperature gauge readings: An inconsistent temperature gauge can indicate that the thermostat is not functioning correctly. A failing gasket may cause the thermostat to misread coolant levels, fluctuating the gauge dramatically between hot and cold.
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Visible damage: Physical inspection can reveal cracks or wear on the thermostat gasket. If you observe any tears or significant wear, it may require replacement. This ensures the thermostat continues to function properly and keeps the engine within the safe operating temperature.
Regular inspection and maintenance of the thermostat gasket in your Jeep TJ can prevent potential overheating issues and maintain optimal engine performance.
What Are the Most Reliable Brands of Thermostat Gaskets for Jeep TJ?
The most reliable brands of thermostat gaskets for Jeep TJ include Fel-Pro, Mishimoto, and OEM Chrysler gaskets.
- Fel-Pro
- Mishimoto
- OEM Chrysler gaskets
Fel-Pro:
Fel-Pro produces high-quality gaskets designed specifically for various automobile applications, including the Jeep TJ. Their gaskets are known for durability and effectiveness in preventing leaks. Fel-Pro uses advanced materials that resist deterioration from coolant exposure, ensuring longevity. According to J.D. Powers, Fel-Pro has received positive customer feedback for their easy installation and reliability in sealing.
Mishimoto:
Mishimoto offers performance gaskets that provide better sealing properties compared to stock gaskets. Mishimoto gaskets are crafted for enthusiasts using premium materials that withstand extreme temperatures and pressures. Their focus on performance means these gaskets often include enhanced features such as improved torque retention. Reviewers frequently mention Mishimoto’s gaskets as a reliable upgrade for those seeking optimized engine performance.
OEM Chrysler Gaskets:
OEM Chrysler gaskets are original equipment parts supplied by the manufacturer for the Jeep TJ. These gaskets guarantee compatibility and adherence to factory specifications. Using OEM parts often results in a perfect fit and reduces the risk of installation errors. While OEM parts may come with a higher price tag, many Jeep owners prefer them for ensuring quality and longevity. Consumer Reports emphasizes that OEM components can sometimes offer better performance than aftermarket alternatives.
Which Jeep TJ Thermostat Gaskets Are Notable for Easy Installation?
Here are notable Jeep TJ thermostat gaskets known for easy installation:
| Gasket Type | Material | Features | Price Range | Availability |
|---|---|---|---|---|
| Mopar Thermostat Gasket | Rubber | OEM quality, snug fit, easy to install | $10 – $15 | Widely available |
| Fel-Pro Thermostat Gasket | Composite | Durable, leak-resistant, user-friendly installation | $5 – $10 | Available online and in stores |
| Victor Reinz Thermostat Gasket | Silicone | High-temperature resistance, straightforward installation | $8 – $12 | Available online |
| Mr. Gasket Thermostat Gasket | Paper | Lightweight, easy alignment, quick setup | $4 – $8 | Available in auto parts stores |
What Features Should You Look For in a High-Performance Thermostat Gasket?
When selecting a high-performance thermostat gasket, consider the following key features to ensure optimal sealing and durability.
- Material Quality
- Temperature Resistance
- Pressure Endurance
- Chemical Resistance
- Thickness
- Compatibility
- Ease of Installation
Different perspectives exist regarding these features. Some users emphasize the importance of material quality and chemical resistance, based on their experiences with degradation in harsh environments. Others prioritize temperature resistance and pressure endurance due to specific engine configurations that demand higher performance. Meanwhile, compatibility and ease of installation are particularly valued by DIY mechanics who seek hassle-free maintenance solutions.
To understand these features better, let’s examine each one in detail.
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Material Quality: The material quality of a thermostat gasket directly affects its longevity and sealing capabilities. High-performance gaskets often use materials like silicone, rubber, or composite materials. For instance, silicone gaskets can withstand extreme temperatures and maintain integrity under pressure, making them suitable for high-performance engines.
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Temperature Resistance: Temperature resistance refers to the ability of a gasket to endure high heat without failing. High-performance thermostat gaskets should ideally handle temperatures exceeding 300°F (149°C). Inadequate temperature resistance may lead to premature wear or failure, causing coolant leaks and engine overheating.
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Pressure Endurance: Pressure endurance denotes how well a gasket can withstand internal pressures generated by the engine. A high-quality thermostat gasket should withstand several pounds of pressure, typically around 15-30 psi. Insufficient pressure endurance could lead to gasket deformation or failure, compromising engine performance.
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Chemical Resistance: Chemical resistance is the ability of a gasket to withstand exposure to various fluids, such as engine oil or coolant. High-performance gaskets must resist degradation from these substances, which can weaken materials over time. The ASTM D471 test is often used to evaluate the chemical resistance of gasket materials.
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Thickness: Thickness affects the gasket’s ability to compress and create a tight seal. Too thick gaskets may not seal properly, while too thin gaskets could be prone to failure. An optimal thickness range for thermostat gaskets typically lies between 1/16 inch (1.5 mm) and 1/8 inch (3 mm), depending on the application.
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Compatibility: Compatibility ensures that the gasket fits the specific engine and thermostat design. Using the right gasket prevents leaks and maintains proper engine function. Many manufacturers provide compatibility charts that list the right gasket for different models.
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Ease of Installation: Ease of installation refers to how straightforward and user-friendly the gasket is when fitting it onto the thermostat housing. Gaskets with alignment features, such as pre-drilled holes or adhesive backing, streamline the installation process. Many DIY enthusiasts cite installation ease as a significant factor in their purchasing decisions.
What Common Mistakes Should You Avoid During the Installation of a Thermostat Gasket?
The common mistakes to avoid during the installation of a thermostat gasket include improper alignment, inadequate cleaning of the surface, using the wrong gasket material, neglecting torque specifications, and failing to check for leaks post-installation.
- Improper alignment of the gasket
- Inadequate cleaning of the mounting surface
- Using the wrong gasket material
- Neglecting torque specifications
- Failing to check for leaks after installation
To ensure a thorough understanding of these common mistakes, let’s explore each point in detail.
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Improper Alignment of the Gasket: Improper alignment occurs when the thermostat gasket does not fit correctly over the designated sealing surface. This mistake can lead to leaks and can compromise the thermostat’s functionality. The gasket should sit evenly without twists or gaps. An aligned gasket ensures that the sealing properties are effective, promoting a proper seal against engine coolant leaks.
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Inadequate Cleaning of the Mounting Surface: Inadequate cleaning happens when the mounting surface is not thoroughly cleaned before installation. Any leftover residue or old gasket material can prevent a proper seal. This situation can lead to coolant leaks and potential engine damage. Using a scraper or solvent to fully clean the area is essential before setting a new gasket.
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Using the Wrong Gasket Material: Using the wrong gasket material can affect its durability and sealing ability. Different engine temperatures and coolant types require specific gasket materials. For example, silicone-based gaskets provide higher temperature resistance than paper gaskets. Consult the manufacturer’s specifications to ensure the correct material is used for your vehicle.
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Neglecting Torque Specifications: Neglecting torque specifications occurs when the bolts securing the thermostat are not tightened to the manufacturer’s recommended levels. This mistake can lead to gasket failure due to either over-tightening or under-tightening. Utilizing a torque wrench ensures that the bolts are secured to the appropriate specifications, helping maintain a reliable seal.
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Failing to Check for Leaks After Installation: Failing to check for leaks post-installation is a critical oversight. Without testing, small leaks may go unnoticed until they cause significant engine issues. After the installation, it is advisable to refill the coolant and run the engine, observing for any leakage signals. This practice ensures that the installation was successful and effective in maintaining the cooling system integrity.
How Do You Maintain the Longevity of a Thermostat Gasket in Jeep TJ?
To maintain the longevity of a thermostat gasket in a Jeep TJ, ensure proper installation, regularly check for coolant leaks, and keep the engine in good condition. These actions help the gasket perform its role effectively and last longer.
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Proper Installation: Correctly install the thermostat gasket to prevent leaks. Ensure that the mating surfaces are clean and free of old gasket material. Use a suitable sealing compound if recommended. A well-sealed gasket can diminish the chances of coolant seeping and causing damage.
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Regularly Check for Coolant Leaks: Monitor the area around the thermostat for coolant leaks. Check the coolant level regularly. An overlooked leak can lead to overheating, which may damage the gasket and other engine components. Addressing leaks promptly can prevent costly repairs.
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Keep the Engine in Good Condition: Maintain the overall health of the engine. Overheating can damage gaskets, including the thermostat gasket. Ensure the cooling system operates efficiently. Regularly service the coolant system, change coolant, and inspect hoses and the radiator.
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Use Quality Parts: Opt for high-quality thermostat gaskets when replacements are necessary. Quality parts often have better durability against heat and coolant exposure. Choosing reputable brands can lead to a longer-lasting gasket.
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Monitor Engine Temperature: Keep an eye on the engine temperature gauge. Operating the vehicle within normal temperature ranges is crucial. Consistent overheating can adversely affect the gasket’s lifespan. Ensure the thermostat operates correctly to regulate engine temperature effectively.
By following these practices, you can enhance the longevity and performance of the thermostat gasket in your Jeep TJ.
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