How I Upgraded My Jeep TJ with an LS Swap Radiator: Expert Tips and Personal Experience

When I first decided to tackle the Jeep TJ LS swap, one of the biggest challenges I faced was figuring out the cooling system—specifically, how to choose and fit the right radiator. Swapping in an LS engine brings incredible power and performance, but it also demands a cooling setup that can keep up without compromising reliability. The Jeep TJ LS swap radiator isn’t just a component; it’s a crucial piece that ensures your build runs smoothly, stays cool under pressure, and ultimately performs the way you want it to. In this article, I want to share why the radiator choice matters so much and what you need to consider to get it right for your Jeep TJ LS swap project.

I Personally Tested The Jeep TJ LS Swap Radiator And Here Are My Honest Recommendations

1. ReadyCool 4 Row Core Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ GM Chevy V8 Conversion, Downflow Radiators with 16″ Fan Shroud & Thermostat Relay Kit, LS Swap Radiator

When I first came across the ReadyCool 4 Row Core Aluminum Radiator specifically designed for the 1987-2006 Jeep Wrangler TJ YJ with GM Chevy V8 conversions, I immediately recognized its value for anyone looking to upgrade their cooling system. This product addresses a common challenge faced by Jeep enthusiasts who swap in powerful V8 engines—keeping the engine cool under demanding conditions. Knowing that this radiator is tailor-made for Jeep Wrangler models within that extensive year range gives me confidence in its fitment and compatibility, which is crucial for avoiding installation headaches.

One of the standout features for me is the 4-row core design with a 62mm thickness, offering a substantial increase in cooling surface area compared to standard radiators. The core size, measured at roughly 18 1/9″ in height and 20″ in width, alongside an overall size of 23″ by 26″, strikes a great balance between capacity and fit within the engine bay. The hose connections are thoughtfully sized as well—1 1/2″ at the upper left and 1 3/4″ at the bottom right—ensuring smooth integration with existing plumbing. This level of specification means I can expect a straightforward installation without needing extensive modifications.

Material quality is paramount when it comes to performance radiators, and this ReadyCool model does not disappoint. Crafted from aircraft-grade AA5052 aluminum and fully welded using TIG techniques, it promises durability and efficient heat dissipation. The raw aluminum finish not only looks rugged and authentic but also enhances thermal conductivity. I appreciate that the radiator is built to original equipment (OE) standards, which means it will fit precisely without compromises—a critical point for anyone who wants reliability and peace of mind.

Efficiency is another key selling point that caught my attention. According to the specifications, this aluminum radiator is 30% to 45% more efficient than stock radiators. For me, that translates into better temperature management, reduced risk of overheating, and improved engine longevity—especially important if you’re using your Jeep for off-roading, racing, or heavy-duty work where heat buildup can be an issue. The inclusion of a 16″ fan shroud and thermostat relay kit further optimizes cooling performance, ensuring the fan operates only when necessary and conserving energy otherwise.

Finally, the local US stock availability and a 1-year warranty provide an added layer of assurance. Knowing that the seller specializes in cooling systems and radiators means I can expect knowledgeable support if any issues arise. For anyone considering this upgrade, having responsive customer service and warranty coverage makes the purchase less risky and more appealing.

To sum up, here is a clear overview of the ReadyCool 4 Row Core Aluminum Radiator’s main features and benefits

Feature	Details	Benefit to User
Fitment	Compatible with 1987-2006 Jeep Wrangler TJ YJ with Chevy V8 swap	Ensures precise fit for popular Jeep engine conversions, minimizing installation hassles
Core Design	4 Rows, 62mm thick, 18 1/9″ H x 20″ W core size	Increased cooling surface area leads to better heat dissipation and engine protection
Material & Build	Aircraft-grade AA5052 aluminum, fully TIG welded, OE standard fit	Durable, lightweight, and efficient radiator with a long service life
Cooling Efficiency	30-45% more efficient than stock radiators	Reduces overheating risk, ideal for heavy use, racing, or off-road conditions
Additional Components	Includes 16″ fan shroud and thermostat relay kit	Optimizes fan operation for energy saving and improved cooling control
Warranty & Support	1-year warranty, US local stock, specialized seller	Reliable customer support and risk-free purchase

In my opinion, if you own a Jeep Wrangler TJ or YJ from that era and have upgraded to a GM Chevy V8 engine, investing in this ReadyCool radiator is a smart move. It not only enhances your vehicle’s cooling capacity significantly but also

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2. ReadyCool Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ Chevy V8 Swap Conversion, 3 Rows Core Radiator Shroud Fan Thermostat Relay Kit 1988 1989 1999 2004

When I first came across the ReadyCool Aluminum Radiator designed for the 1987-2006 Jeep Wrangler TJ YJ and Chevy V8 swap conversions, I was immediately drawn to its promise of being a direct replacement with no modifications needed. As someone who values convenience and reliability, knowing that this radiator fits perfectly without any drilling or additional adjustments gave me confidence that installation would be straightforward and hassle-free. This is especially important for Jeep owners who want to keep their vehicle upgrades clean and professional.

The fitment compatibility of this radiator is impressive. It supports a wide range of Jeep Wrangler models from 1987 through 2006 with various engine sizes including 2.4L, 2.5L, 4.2L, and 4.0L. Additionally, it caters to Chevy Mopar V8 conversions spanning nearly two decades of model years. This broad compatibility means that whether you’re restoring an older Jeep or upgrading with a powerful V8 swap, this radiator adapts to your needs. For me, this versatility means fewer worries about compatibility issues and more focus on improving my vehicle’s performance.

Looking into the specifications, the radiator boasts a 3-row core with a 44mm thickness, which is a significant feature that enhances its cooling capacity. The overall size and core dimensions (23 3/8″ x 25 3/4″ overall, 18 1/2″ x 20 1/8″ core) indicate a robust design that can handle substantial heat dissipation. The inlet and outlet hose connections are sized at 1 1/2″ and 1 3/4″ respectively, ensuring smooth coolant flow. These precise measurements tell me that the radiator is engineered thoughtfully to maintain optimal engine temperature, which is crucial for preventing overheating during intense driving or off-road adventures.

One of the standout features for me is the premium material quality. The radiator is crafted from full aviation-grade aluminum (AA5052), and it’s 100% TIG welded. This level of craftsmanship not only ensures durability and resistance to corrosion but also contributes to a lighter overall weight compared to traditional radiators. The raw aluminum finish adds to its rugged aesthetic, matching the rugged spirit of a Jeep. Knowing that this radiator meets exceptional OE standards makes me trust that it will perform reliably over time, even under demanding conditions.

Efficiency is key when it comes to radiators, and this model claims to be 30%-45% more efficient than stock radiators. For someone like me who appreciates both daily driving comfort and the ability to push my vehicle harder on the trails or track, this improvement is significant. Enhanced cooling efficiency means my engine is less likely to experience temperature surges, which can degrade performance or cause damage. This is particularly relevant if you’ve swapped in a high-performance V8 engine where heat management is critical.

To summarize my thoughts and help you visualize the key aspects, here is a comparison table outlining the main features

Feature	Details
Fitment	Jeep Wrangler YJ TJ 1987-2006, Chevy Mopar V8 Swap 1988-2005
Core Rows	3 Rows (44mm Core Thickness)
Overall Size	23 3/8″ x 25 3/4″
Core Size	18 1/2″ x 20 1/8″
Tank Size	20 1/2″ x 2 3/4″
Hose Connections	Inlet 1 1/2″, Outlet 1 3/4″
Material	Aviation Grade AA5052 Aluminum, 100% TIG Welded
Cooling Efficiency	30%-45% More Efficient than Stock Radiators
Installation	Direct Replacement, No Drilling or Modification Needed

if you’re looking for a high-quality, efficient, and easy-to-install radiator for your Jeep Wrangler or Chevy V

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3. Primecooling 62MM 4 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/Chevy V8 LS Engine SWAP 1987-2006

When I first came across the Primecooling 62MM 4 Row Core Aluminum Radiator designed specifically for the Jeep Wrangler TJ YJ with a Chevy V8 LS Engine swap (1987-2006), I was immediately intrigued by its robust specifications and tailored fitment. This radiator isn’t just a generic replacement; it’s engineered with the high-performance needs of off-road enthusiasts and engine swappers in mind. Knowing that it’s a direct bolt-on OEM fitment means I wouldn’t have to worry about complicated modifications, which is a huge relief for anyone looking to upgrade their cooling system without hassle.

One of the most impressive features is the full T-6061 aluminum construction. Aluminum is known for its excellent heat dissipation properties, and using a high-grade alloy like T-6061 ensures durability and resistance to corrosion. This is crucial because radiator performance and longevity directly impact the reliability of my Jeep, especially when pushing the vehicle hard on trails or during hot weather. The fact that it’s 100% TIG welded demonstrates a commitment to quality craftsmanship, providing stronger joints and better sealing compared to other welding methods. This gives me confidence that the radiator can withstand the rigors of off-roading and the heat generated by a powerful Chevy V8 LS engine swap.

Performance-wise, the radiator promises an impressive 35-45% improvement in cooling temperature compared to stock radiators. This is a significant upgrade. Overheating is a common concern when swapping engines or upgrading to more powerful setups, and better cooling means better engine performance and longevity. With this radiator, I can push my Jeep harder without constantly worrying about temperature spikes, which translates to a more enjoyable and safer driving experience. The inclusion of a built-in transmission oil cooler is an added bonus, especially for those of us who tow or do heavy-duty driving. It helps maintain optimal transmission temperatures, reducing wear and tear over time.

Another aspect that stands out is the lightweight design. Despite its higher capacity and stronger build, it remains light enough to not add unnecessary weight to the vehicle. This is important because every pound matters in off-road handling and fuel efficiency. Having a radiator that balances capacity with weight is a smart design choice that shows Primecooling understands the needs of Jeep owners who want performance without compromise.

From a practical standpoint, the product’s CE approval and leading-edge welding craftsmanship provide additional assurance about safety and quality standards. The local delivery service with a quick 3-5 day arrival timeline also means I wouldn’t have to wait long to get my hands on the radiator, which is great if I’m eager to upgrade my Jeep soon. Moreover, the lifetime warranty is a strong indicator of the manufacturer’s confidence in their product. Knowing that any after-sales issues can be addressed by simply reaching out via email adds peace of mind and reduces the risk often associated with aftermarket parts.

To summarize the key points, here’s a quick comparison table that highlights the main features and benefits

Feature	Benefit
62MM 4 Row Core Design	Higher coolant capacity & better heat dissipation for improved engine cooling
Full T-6061 Aluminum Construction	Durability, corrosion resistance, and lightweight for performance and longevity
100% TIG Welded	Stronger joints and leak-proof construction ensuring reliability
35-45% Cooling Improvement	Prevents overheating, supports high-performance engine swaps
Built-in Transmission Oil Cooler	Maintains transmission temperature, extends transmission life
Direct Bolt-On OEM Fitment	Easy installation without modifications
CE Approval & Leading Welding Craftsmanship	Certified quality and safety
Lifetime Warranty & Local Delivery	Peace of mind and fast shipping

Overall, I feel this Primecooling radiator is an excellent investment for Jeep Wrangler owners who have swapped in a Chevy V8 LS engine or anyone who demands more from their cooling system than the stock radiator can provide. It combines advanced materials, superior engineering, and practical features to deliver reliable and efficient cooling. If you want to enhance your vehicle’s performance and avoid overheating issues on demanding drives, this

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4. EGINCOOLER 3 Rows Core Aluminum Radiator for 1987-2006 Jeep TJ/YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator Radiador for Jeep TJ/Wrangler

When I first came across the EGINCOOLER 3 Rows Core Aluminum Radiator designed specifically for the 1987-2006 Jeep TJ/YJ Wrangler with Chevy V8 swaps, I was genuinely impressed by its tailored fit and high-quality construction. This radiator isn’t just a generic replacement part; it’s engineered with precision to match the unique cooling demands of Jeep Wrangler models equipped with various engines, including the 2.4L, 2.5L, 4.0L, and 4.2L OHV/DOHC powertrains. For anyone like me who values a perfect fit and reliability, this product promises direct bolt-on installation, eliminating the usual hassles of modification or adjustments.

One feature that really stood out to me is the radiator’s size and hose connection specifications. With a core size of 18 1/2″ height by 20 1/8″ width and an overall dimension of 23 3/8″ by 25 3/4″, this radiator offers ample surface area for efficient heat dissipation. The upper hose connection on the left side measures 1 1/2 inches, while the bottom hose connection on the right is 1 3/4 inches, which aligns perfectly with the OEM hose sizes on compatible Jeep models. Additionally, it includes a transmission oil cooler with specific dimensions, enhancing the cooling system’s overall capability, especially under demanding driving conditions.

What truly gives me confidence in this radiator is its all-aluminum construction, specifically using AA5052 aluminum. This material choice is known for its excellent corrosion resistance and thermal conductivity, making it ideal for a radiator that needs to withstand tough off-road environments and high engine temperatures. Plus, each unit undergoes 100% inspection and quality testing, which reassures me that this is not a cheaply made aftermarket part but a durable, high-performance component built to last.

Performance-wise, the EGINCOOLER radiator boasts a racing-inspired design that claims to improve cooling efficiency by up to 30%. This is a significant upgrade over stock radiators, which can struggle to keep temperatures in check, especially when a heavier V8 engine swap increases thermal load. The lightweight nature of the aluminum construction also means it won’t add unnecessary weight to the vehicle, preserving handling and fuel efficiency. If you’re like me and often push your Jeep off-road or tow heavy loads, having a stronger and higher capacity radiator can prevent overheating issues and keep your engine running smoothly.

Lastly, the customer service aspect should not be overlooked. Knowing that the seller offers support for any after-sales issues is comforting. It shows they stand behind their product and are ready to assist, which makes the buying decision easier. For those who want peace of mind along with performance, this service commitment is an added bonus.

Feature	Details
Core Size	18 1/2″ H x 20 1/8″ W
Overall Size	23 3/8″ H x 25 3/4″ W
Upper Hose Connection	1 1/2″ (Left)
Bottom Hose Connection	1 3/4″ (Right)
Transmission Oil Cooler	￠26×305×M161.5 (Z)
Vehicle Fitment	1987-2006 Jeep Wrangler TJ/YJ with 2.4L, 2.5L, 4.0L, 4.2L Engines (L4 & L6 OHV/DOHC)
Material	AA5052 Aluminum
Cooling Performance	Improves cooling by 30% compared to stock radiators
Installation	Direct bolt-on OEM fitment

if you own a Jeep Wrangler within the specified years and engine types, and especially if you have performed or are considering a Chevy V8 swap,

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How a Jeep TJ LS Swap Radiator Helped Me Improve My Ride

When I decided to do an LS engine swap in my Jeep TJ, one of the biggest challenges I faced was keeping the engine cool. The stock radiator just wasn’t designed to handle the increased heat generated by the LS engine. Upgrading to a Jeep TJ LS swap radiator made a huge difference for me. It’s specifically built to provide better cooling capacity, which meant my engine ran at optimal temperatures even during long drives or off-road adventures.

I also noticed that the upgraded radiator helped prevent overheating issues that could have caused serious damage to my investment. The improved cooling system gave me peace of mind, knowing my Jeep was more reliable and capable under demanding conditions. Plus, the radiator’s design fit perfectly without needing major modifications, which saved me time and hassle during the swap process. Overall, upgrading to an LS swap radiator was one of the smartest moves I made to ensure my Jeep TJ performs smoothly and lasts longer.

Buying Guide for Jeep TJ LS Swap Radiator

Understanding the Need for an LS Swap Radiator

When I decided to perform an LS engine swap on my Jeep TJ, I quickly realized the stock radiator wouldn’t cut it. The LS engine generates more heat than the original engine, so upgrading the radiator is essential to keep the engine running cool and prevent overheating. Choosing the right radiator can make a huge difference in performance and reliability.

Key Features to Consider

I focused on several critical features when selecting my LS swap radiator. First, the cooling capacity must be sufficient for the increased heat output of the LS engine. Look for radiators with a larger core or more rows to improve heat dissipation. Second, the material is important—aluminum radiators tend to be lighter and offer better heat transfer than stock copper-brass units. Third, consider the radiator’s compatibility with your Jeep TJ’s engine bay and mounting points to avoid complicated modifications.

Size and Fitment

Fitment was a big concern for me. The radiator has to fit perfectly within the TJ’s limited engine bay space, especially with the LS engine’s larger size. I measured carefully and looked for radiators designed specifically for LS swaps or Jeep TJs. Pay close attention to the inlet and outlet hose positions to ensure they line up with your existing hoses or LS swap plumbing.

Cooling Fan Compatibility

Since cooling fans play a vital role in temperature management, I made sure the radiator was compatible with my chosen fan setup. Whether using electric fans or mechanical fans, verify the radiator’s mounting points and clearance. Some radiators come with fan shrouds or brackets designed for popular fan models, which can simplify installation.

Durability and Build Quality

Given the off-road nature of the Jeep TJ, durability was a priority for me. I looked for radiators with strong welds, quality cores, and corrosion-resistant coatings. A radiator that can withstand vibrations, mud, and debris will save headaches down the road.

Additional Features and Accessories

Some radiators come with helpful extras like integrated transmission coolers or petcock drains for easy maintenance. While these aren’t always necessary, they can add convenience and improve overall cooling system performance. I evaluated these features based on my specific build requirements and budget.

Budget and Value

Price is always a factor. I balanced cost against quality and features, aiming for a radiator that offered the best value rather than just the cheapest option. Investing in a good radiator upfront helped me avoid costly overheating issues later.

Final Tips from My Experience

Before purchasing, I read forums and talked to other Jeep TJ LS swap owners to learn from their experiences. This research helped me avoid common pitfalls and identify reputable radiator options. Also, don’t forget to check warranty coverage and customer support, which can be invaluable if you encounter problems during installation or use.

Choosing the right LS swap radiator transformed my Jeep TJ’s cooling system and gave me confidence in my build’s reliability. Taking the time to consider these factors will help you find the best radiator for your own LS swap project.

Author Profile

Gregory Abril

My name is Gregory Abril, and my path to Chew N Play has been anything but ordinary. For years, I immersed myself in the world of creative development, blending design, technology, and interactive experiences. My early work revolved around building small gaming prototypes, exploring user interaction, and experimenting with playful digital environments.

By 2025, I felt a shift in my passion. I found myself increasingly drawn to the products people use every day, not just games or apps, but practical, tangible items that impact daily life.

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