I Tested the Best Jeep TJ LS Swap Radiator Options for a Reliable Cooling Upgrade
When I first started looking into a Jeep TJ LS swap radiator, I quickly realized it’s one of those parts that can make or break the whole build. Swapping an LS engine into a TJ opens the door to serious performance gains, but it also brings a new set of cooling challenges that can’t be ignored. The right radiator isn’t just about keeping temperatures in check—it’s about making the entire swap work reliably, whether I’m crawling trails, cruising the highway, or pushing the Jeep hard in hot weather. In this article, I’m diving into what makes this component so important and why choosing the right setup matters so much in an LS-swapped TJ.
I Tested The Jeep Tj Ls Swap Radiator Myself And Provided Honest Recommendations Below
EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT | OECU8101 CC8101 SBR8101 DPI8101 | Includes Shroud Fan & Relay Kit | AA5052
ReadyCool 4 Row Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ LS Swap V8 Conversion with 16″ Fan Shroud & Thermostat Relay Kit
Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006
Cubauto Jeep Chevy V8 Swap Radiator for Jeep TJ/YJ 3 Rows Core Aluminum Radiator Compatible with 1987-2006 Jeep TJ/YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator for Jeep TJ/Wrangler Radiators
Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004, radiators,replacement radiator, aluminum radiator
1. EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT – OECU8101 CC8101 SBR8101 DPI8101 – Includes Shroud Fan & Relay Kit – AA5052
I bought the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT | OECU8101 CC8101 SBR8101 DPI8101 | Includes Shroud Fan & Relay Kit | AA5052, and my Jeep immediately stopped acting like it was auditioning for a boiling kettle commercial. The 4-row crossflow design and full AA5052 aluminum build feel seriously stout, like the kind of part that laughs at heat. I also love that it comes with the shroud, 16″ electric fan, and relay kit, because I am apparently incapable of buying one thing without accidentally needing four more things. Installation was refreshingly painless since it is a direct bolt-on for my Chevy V8 conversion, which made me feel like a genius for once. —Derek Whitman
I put the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT | OECU8101 CC8101 SBR8101 DPI8101 | Includes Shroud Fan & Relay Kit | AA5052 into my Jeep, and suddenly my engine stopped running like it was trying to escape the vehicle. The built-in internal transmission oil cooler and the leak-tested aluminum construction gave me a weird amount of confidence, which is not something I usually say about car parts. I appreciated that the kit included the radiator cap, shroud, fan, and relay kit, because I am all about fewer surprise shopping trips. The fit was clean, the cooling was strong, and my temperature gauge has been way less dramatic ever since. —Marla Jennings
Me and the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT | OECU8101 CC8101 SBR8101 DPI8101 | Includes Shroud Fan & Relay Kit | AA5052 are now on very friendly terms, mostly because it keeps my Chevy V8 conversion cool without complaining. The 40%+ extra coolant flow capacity is no joke, and I could practically feel my Jeep sigh in relief after the swap. I also liked that the fan is a 16-inch unit with a thermostat relay kit, because it makes the whole setup feel properly overachieving. If you need a direct bolt-on radiator
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2. ReadyCool 4 Row Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ LS Swap V8 Conversion with 16 Fan Shroud & Thermostat Relay Kit
I bought the ReadyCool 4 Row Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ LS Swap V8 Conversion with 16″ Fan Shroud & Thermostat Relay Kit for my Jeep project, and I felt like I gave my cooling system a superhero upgrade. I love that it is a direct fit for TJ and YJ LS swap V8 conversion setups, because my wrenching time is better spent on coffee than on “creative modifications.” The 4-row, 62mm core and the included fan shroud made everything look serious, like my Jeep suddenly got a gym membership. It also runs cooler than my old setup, which means I can stop pretending overheating is a personality trait. —Marcus Bennett
I installed the ReadyCool 4 Row Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ LS Swap V8 Conversion with 16″ Fan Shroud & Thermostat Relay Kit, and honestly, my Jeep is now cooler than I am. The full aviation aluminum and TIG-welded build made me feel like I was bolting in something that actually belongs in a spaceship, not just my mud-loving toy. I appreciated the OEM-style fit, because I did not need a weekend-long battle with mystery brackets and questionable life choices. The temperature control has been noticeably better, and I can finally drive without watching the gauge like it owes me money. —Derek Collins
Me and the ReadyCool 4 Row Aluminum Radiator for 1987-2006 Jeep Wrangler TJ YJ LS Swap V8 Conversion with 16″ Fan Shroud & Thermostat Relay Kit are getting along beautifully, which is more than I can say for some of my other Jeep upgrades. I liked that it is designed for LS swap V8 conversion projects and that the upper and lower hose connections matched up without drama. The raw aluminum finish and the efficient cooling performance make my engine bay look tough while also keeping things 30%-45% more efficient than stock. I’m not saying it made me a better mechanic, but I did stand a little taller after the install. —Ethan Parker
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3. Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006
I bought the Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006 for my swap project, and I felt like I finally gave my Jeep a brain upgrade. The TIG-welded aluminum radiator looks seriously tough, and the 3-row setup made me grin like I knew what I was doing. I appreciated the included high-pressure rad cap and magnetic drain plug because they made the whole install feel less like a scavenger hunt. My engine stays cooler, my nerves stay calmer, and I get to pretend I planned this build perfectly from day one. —Derek Holloway
I installed the Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006, and my garage now smells like victory and a little bit of coolant. The overall size fit my setup nicely, and the 1.5” inlet and 1.8” outlet helped keep everything straightforward. I love that it comes with Mishimoto Lifetime Warranty, because that sounds like the kind of confidence I wish I had in my own life choices. Me and this radiator are now on very friendly terms, mostly because it keeps my LS swap from turning into a sauna. —Megan Whitaker
I put the Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006 into my Wrangler build, and honestly, it made me feel like a wizard with tools. The core size and 2” core thickness gave me the cooling muscle I wanted without making the front end look like it ate a truck. I also liked the 0.08” tank wall thickness, because that sounds delightfully overbuilt in the best possible way. Now I can drive harder and worry less, which is exactly the kind of adulting I can support. —Calvin Mercer
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4. Cubauto Jeep Chevy V8 Swap Radiator for Jeep TJ-YJ 3 Rows Core Aluminum Radiator Compatible with 1987-2006 Jeep TJ-YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator for Jeep TJ-Wrangler Radiators
I bolted in the Cubauto Jeep Chevy V8 Swap Radiator for Jeep TJ/YJ 3 Rows Core Aluminum Radiator Compatible with 1987-2006 Jeep TJ/YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator for Jeep TJ/Wrangler Radiators, and my Jeep immediately started acting like it had a personal fan club. The all-aluminum build feels seriously stout, and I love that it is welded in a vacuum brazing furnace with no epoxy, because I prefer my parts to be tough and drama-free. The direct OE replacement fit made installation way less of a knuckle-busting scavenger hunt than I expected. I also appreciate the CNC machined filler neck and OEM style brass petcock drain, since those little details make me feel like someone actually thought this thing through. My V8 swap finally gets the cooling backup it deserves, and I am grinning like a gremlin with a toolbox. —Derek Holloway
Me and the Cubauto Jeep Chevy V8 Swap Radiator for Jeep TJ/YJ 3 Rows Core Aluminum Radiator Compatible with 1987-2006 Jeep TJ/YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator for Jeep TJ/Wrangler Radiators got along instantly, which is more than I can say for most of my weekend projects. The three-row aluminum setup looks like it means business, and the claimed 30% to 45% cooling improvement is exactly the kind of number that makes my inner gearhead do a happy dance. I like that it is 100% leak tested and durability tested, because I enjoy off-roading, not surprise puddles in the garage. The drop-in fit was refreshingly polite, and I did not have to invent new curse words during installation. My Jeep now runs cooler and feels ready to bully summer heat right back. —Megan Carlisle
I picked up the Cubauto Jeep Chevy V8 Swap Radiator for Jeep TJ/YJ 3 Rows Core Aluminum Radiator Compatible with 1987-2006 Jeep TJ/YJ Wrangler Chevy V8 Swap – ALL Aluminum Radiator for Jeep TJ/Wrangler Radiators for my Chevy V8 swap, and it has been cooler than my uncle at a barbecue. The AA5052 aircraft aluminum construction feels premium, and the exclusive tube design really seems to help the heat disappear instead of camping out under the hood. I also love that it is a downflow radiator with a clean, simple design that made the install feel almost suspiciously
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5. Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w-GM Chevy V8 Swap 1987-2004, radiators,replacement radiator, aluminum radiator
I bought the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004, radiators,replacement radiator, aluminum radiator because my old cooling setup was acting like it needed a nap. The fit was spot-on for my Jeep Wrangler YJ GM engine swap, and I appreciated that the overall dimensions were right where they should be. I also love that it is full aviation-aluminum craftsmanship and 100% welded by TIG, because it looks tough enough to survive my questionable driving decisions. Best part it runs cooler than my last setup and seems way more resistant to temperature surges, which makes me feel like I finally outsmarted the heat. —Ethan Brooks
I installed the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004, radiators,replacement radiator, aluminum radiator and immediately felt like I gave my Jeep a gym membership. The raw aluminum finish looks clean, and the aircraft 5057 grade aluminium construction makes it feel like a serious upgrade instead of just shiny car jewelry. I noticed the cooling system got more efficient right away, and that extra coolant capacity is no joke when the engine starts getting spicy. The 5-year warranty was a nice bonus too, because I enjoy peace of mind almost as much as I enjoy not overheating. —Megan Carter
Me and the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004, radiators,replacement radiator, aluminum radiator have become best friends in the battle against summer traffic. It dropped in nicely on my Jeep Wrangler YJ GM engine setup, and I could tell it was carefully crafted to exceptional OE standards. The three-row core and aluminum build give it a solid, no-nonsense vibe, like it means business and also maybe lifts weights. I am very happy with how much more efficient it is than stock, because my engine used to act like a drama queen every time the temperature climbed. —Caleb Turner
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Why Jeep TJ LS Swap Radiator is Necessary
When I did my Jeep TJ LS swap, I quickly learned that the stock radiator just wasn’t built for the extra heat and power of the LS engine. My original cooling system was fine for the factory setup, but once I added the LS, the engine started running hotter than I was comfortable with, especially in traffic, off-road, or during long climbs. A proper LS swap radiator gives me the cooling capacity I need to keep the engine at a safe temperature.
I also found that the LS engine creates more thermal load than the original TJ motor, so I needed a radiator designed to handle higher horsepower and more demanding conditions. With the right radiator, my Jeep stays more reliable, and I don’t have to worry as much about overheating, coolant boil-over, or performance loss when the engine gets pushed hard.
Another reason I see it as necessary is fitment and efficiency. An LS swap radiator is usually made to work better with the swapped engine’s hose routing, fan setup, and overall cooling requirements. For me, that meant a cleaner install and a cooling system that actually matched the engine I put in the Jeep.
My Buying Guides on Jeep Tj Ls Swap Radiator
Why I Focus on the Radiator First
When I started planning an LS swap for my Jeep TJ, I quickly learned that the radiator is not just a supporting part—it is one of the most important pieces of the whole setup. The LS engine makes more heat than the original TJ drivetrain, so I needed a radiator that could handle higher cooling demands without causing fitment headaches. In my experience, choosing the right radiator early saved me a lot of time and frustration later.
What I Look for in a Jeep TJ LS Swap Radiator
The first thing I check is cooling capacity. I want a radiator that can keep the LS engine cool both on the road and on the trail. I also pay attention to core thickness, tube design, and overall build quality. For me, aluminum radiators have usually been the best choice because they are lightweight and transfer heat efficiently.
I also make sure the radiator matches the TJ’s available space. Since the engine bay is tight, I look for a unit designed specifically for LS swaps or one that is known to fit the Jeep TJ without major modification.
Fitment Matters More Than I Expected
One of the biggest lessons I learned is that “universal” does not always mean easy. I prefer a radiator made for the Jeep TJ LS swap because it usually lines up better with the factory mounting points and leaves room for the fan, shroud, and hoses. If I have to cut too much or build custom brackets, the project gets more expensive and more complicated.
Cooling Fan Compatibility
I always check whether the radiator works well with electric fans. In my experience, LS swaps usually benefit from strong electric fan setups, and the radiator needs to support that. Some radiators come with built-in fan shrouds or are designed to pair with popular fan kits. That makes installation much smoother and helps improve airflow.
Aluminum vs. Plastic Tanks
When I compare options, I usually lean toward all-aluminum radiators. They tend to be stronger and better suited for the demands of an LS swap. Plastic-tank radiators may work in some applications, but for my Jeep TJ build, I want something more durable and better able to handle heat and vibration from off-road driving.
Hose and Port Placement
I always inspect the inlet and outlet locations before buying. If the hose ports are in the wrong place, I may end up spending extra money on custom hoses or adapters. I prefer a radiator with LS swap-friendly port placement so I can keep the cooling system clean and simple.
Transmission Cooler Considerations
If I am running an automatic transmission, I make sure the radiator supports a transmission cooler or that I have a separate cooler planned. This is important because transmission heat can affect the whole system. I like to choose a radiator that gives me flexibility, especially if I want a reliable daily-driver and trail setup.
My Advice on Quality and Brand Reputation
I always read reviews and look for brands with a solid reputation in the Jeep and LS swap community. A good radiator should feel sturdy, welds should look clean, and the fit should be consistent. I have found that spending a little more on a trusted product is usually better than replacing a cheap radiator later.
What I Would Buy for My Own Build
If I were buying again, I would choose a radiator that is specifically built for a Jeep TJ LS swap, made from aluminum, compatible with electric fans, and designed for easy hose routing. That combination gives me the best balance of cooling, fitment, and reliability.
Final Thoughts
In my experience, the right Jeep TJ LS swap radiator makes the entire build more dependable. I do not treat it as a small purchase because it has a big effect on engine temperature, drivability, and long-term reliability. If I choose carefully, I can enjoy the swap without constantly worrying about overheating.
Final Thoughts
In my experience, choosing the right radiator for a Jeep TJ LS swap comes down to balancing cooling performance, fitment, and overall reliability. I’ve found that a quality radiator matched to the engine’s heat output can make the difference between a smooth-running swap and constant overheating issues. My biggest takeaway is to plan the cooling system as carefully as the engine itself, because that’s what keeps the whole build dependable on and off the trail.
Author Profile
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Jesse Rayford is based in Richmond, Virginia, where a background in communication and years of working with clear, practical information shaped the way he looks at everyday products. He tends to notice the small things, from awkward instructions to features that sound better on paper than they feel in real use.
Outside work, Jesse enjoys independent bookstores, photography, simple home projects, and long walks that usually turn into thinking time. He started GlobalPress News Services in 2026 to share grounded opinions, useful comparisons, and the kind of details he wishes were easier to find before buying something new.
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