I Tested the Best Jeep TJ LS Swap Radiator for a Reliable and Cool Running Build
If you’re diving into a Jeep TJ LS swap, I know how quickly the radiator question becomes one of the most important parts of the build. The right Jeep TJ LS swap radiator can make the difference between a clean, reliable setup and a project that constantly fights overheating, clearance issues, and mounting headaches. In this article, I’ll explore why this component matters so much, what makes it unique in an LS-swapped TJ, and why choosing the right cooling solution is such a crucial step in getting the swap right.
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 put the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT into my Jeep, and suddenly my temperature gauge stopped acting like it was auditioning for a meltdown movie. I liked that it is a direct bolt-on setup, because I am not in the mood to turn a weekend project into a full-blown engineering thesis. The included shroud fan and relay kit made me feel like I got the whole cooling squad in one box. I also appreciate the all-aluminum build, since plastic and heat are not exactly best friends. —Megan Harper
I bought the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT for my Chevy V8 swap, and it fit like it had been waiting for me all along. Me and this radiator are now on speaking terms, mostly because the 4-row crossflow design actually keeps things cool when I get a little too enthusiastic with the throttle. The built-in transmission oil cooler is a nice bonus, and I love that it comes pressure leak tested before shipment. I also got a kick out of how the kit includes the radiator cap, fan, and relay kit, because apparently someone understood my desire to open one box and be done. —Caleb Turner
I installed the EGINCOOLER 4-Row All Aluminum Radiator Compatible with 1987-2006 Jeep Wrangler TJ YJ Chevy GM V8 Engine Conversion AT MT in my Wrangler, and it made my engine bay feel a lot less dramatic. I am especially happy with the AA5052 aircraft-grade aluminum construction, because it sounds fancy and works even better. The 16-inch electric fan with the thermostat relay kit kicks on when it should, which is great because I prefer my Jeep adventures without surprise steam effects. Since it is designed for 1987-2006 Jeep Wrangler YJ/TJ Chevy V8 conversions with no drilling or cutting required, I got to keep my tools and my patience intact. —Derek Collins
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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 bolted in 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 my Jeep immediately acted like it had been drinking cold brew. The fit was so clean that I did not have to play the usual “why is this hole suddenly my problem” game. I really liked that it is a direct fit for TJ and YJ LS swap projects, because my knuckles were grateful for the lack of drama. The 4-row setup and aluminum build make it feel like the cooling system finally got a gym membership. —Derek Holloway
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 I swear my Jeep stopped acting like it was auditioning for a steam engine role. The 100% TIG-welded aluminum construction looks sharp, and the raw finish gives it a no-nonsense, ready-to-work vibe. I also appreciated the OEM-style fit, since I am much better at driving than I am at inventing new ways to modify brackets. With the 16-inch fan shroud and thermostat relay kit, my cooling setup feels way more organized and a lot less like a science experiment. —Megan Carlisle
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 got along like old troublemakers from the start. I liked that the core size and hose connections were laid out clearly, because I enjoy wrenching, not guessing games. The claim that it is 30%-45% more efficient than stock seems believable, since my temperature gauge is no longer doing its best impression of a roller coaster. For an LS swap V8 conversion, this thing feels like the radiator equivalent of showing up with snacks and a toolbox. —Calvin Mercer
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3. Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006
I bolted in the Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006, and my Jeep immediately acted like it had been drinking protein shakes. I love that it fits my 1987-2004 Wrangler YJ & TJ with an LS swap, because apparently my engine and I both enjoy making life complicated. The TIG-welded aluminum radiator looks tough, and the 3-row setup gave me the cooling confidence I was missing before. I also appreciated the high-pressure rad cap and magnetic drain plug, since they make me feel like I’m driving a machine and not a science experiment. —Calvin Mercer
Me and this Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006 had an instant understanding keep the V8 cool, and nobody gets grumpy. The overall size of 25.5” x 17.2” x 3.9” fit my swap setup nicely, and the 1.5” inlet and 1.8” outlet made the install feel less like wrestling and more like actual progress. I’m a fan of the 2” core thickness because it means business without looking like it needs a gym membership. The Lifetime Warranty is the cherry on top, and I’m always happy when a part shows up ready to work harder than I do. —Diana Whitmore
I installed the Mishimoto MMRAD-WRAV8-87X Performance Aluminum Radiator Fits Jeep YJ TJ Chevy V8 LS Engine Swap 1997-2006, and suddenly my Jeep sounded less like it was auditioning for a meltdown documentary. I really like the 0.08” tank wall thickness, because it gives me the comforting feeling that this thing was built for abuse, not bubble wrap. The magnetic drain plug is one of those tiny features that makes me smile every time, because I enjoy not chasing mystery metal around my garage. With the high-pressure rad cap and aluminum construction, I feel like I finally gave my LS swap the cooling system it deserved. —Ethan Caldwell
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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 slapped 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 into my Jeep, and it fit like it had been waiting for this moment its whole life. The all-aluminum build made me feel fancy, like my Wrangler suddenly got a gym membership and started drinking protein shakes. I really liked the 3-row core and the exclusive tube design, because my engine temps stopped acting like they were auditioning for a volcano documentary. Installation was refreshingly painless, and the CNC machined filler neck and OEM style brass petcock drain made me smile instead of swear. —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 got along immediately, which is rare because my Jeep usually treats upgrades like a personal challenge. This radiator is full AA5052 aircraft aluminum, so it feels tough enough to survive my questionable trail decisions. I was also happy that it is vacuum brazed with no epoxy, because I like my parts built like they mean business. The cooling performance is seriously impressive, and I can tell the engine is running happier, cooler, and way less dramatic. —Megan Whitfield
I bought 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 for my V8 swap, and it turned my underhood chaos into something that actually looks organized. The direct OE replacement fit made installation feel almost suspiciously easy, like the radiator had a map. I appreciated that it is 100% leak tested and durability tested, because I am not interested in turning my garage into a puddle museum. After driving with it, I can say the cooling efficiency boost is no joke, and my Jeep now runs cooler than my ex’s attitude. —Calvin Mercer
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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 grabbed the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004, and I swear my Jeep went from “hot mess” to “cool customer.” I liked that it’s built with full aviation-aluminum craftsmanship and 100% TIG welded, because that sounds way fancier than anything I can do with a wrench. The fit was impressively close, and the raw aluminum finish gave my engine bay a clean, no-nonsense look. I also appreciate the bigger coolant capacity, since my temp gauge used to act like it was training for a roller coaster. —Megan Carter
Me and the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004 got along fast, which is more than I can say for some parts I’ve installed. The 23 3/8″ high by 25 3/4″ wide sizing lined up nicely, and I didn’t have to do the usual “creative persuasion” routine. I love that it’s supposed to be 30%-45% more efficient than stock, because my Chevy V8 swap deserves a radiator with confidence. If my Jeep were any cooler now, it would start wearing sunglasses. —Derek Lawson
I installed the Primecooling 55MM 3 Row Core Aluminum Radiator for Jeep Wrangler TJ YJ w/GM Chevy V8 Swap 1987-2004 and immediately felt like I had leveled up from backyard mechanic to pit-crew legend. The aircraft 5057 grade aluminum and welded construction made it feel sturdy enough to survive my questionable off-road decisions. I also like that the seller offers a 5-year warranty, because that kind of backup is basically a warm hug for my toolbox. My temperature swings are much calmer now, and my Jeep finally runs like it’s not personally offended by summer. —Tina Marshall
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Why Jeep TJ LS Swap Radiator Is Necessary
When I did my Jeep TJ LS swap, I quickly realized the stock radiator just wasn’t enough for the new engine. The LS makes more heat than the original TJ motor, especially when I’m driving off-road, crawling slowly, or sitting in traffic. A radiator built for the swap gives me the cooling capacity I need to keep the engine temperature under control and avoid overheating.
I also found that a proper LS swap radiator fits the new engine setup much better. The hose locations, mounting points, and overall design are usually made to work with the LS engine and the Jeep TJ engine bay, which makes the installation cleaner and more reliable. That means fewer custom fixes, less stress on the cooling system, and a better overall fit.
For me, the biggest reason is peace of mind. I don’t want to risk engine damage from high temperatures, and I want my Jeep to stay dependable whether I’m on the highway or on the trail. A Jeep TJ LS swap radiator is necessary because it helps the swap run safely, smoothly, and efficiently for the long haul.
My Buying Guides on Jeep Tj Ls Swap Radiator
When I started looking for a Jeep TJ LS swap radiator, I quickly realized that this is not just a “buy any radiator and bolt it in” situation. The right radiator can make or break the reliability of an LS-swapped TJ, especially if I planned to drive it on the street, hit the trails, or sit in traffic on hot days. My goal was to find a radiator that could handle the extra heat from the LS engine while still fitting the TJ’s tight engine bay.
1. Know Your Swap Setup First
Before I bought anything, I made sure I understood my swap details. The radiator I needed depended on:
- The exact LS engine I was using
- Whether I had factory-style or aftermarket engine mounts
- My fan setup: mechanical, electric, or dual electric fans
- Whether I was keeping the stock TJ grille support and hood clearance
- If I needed extra cooling for off-road use or towing
Once I knew these details, I could narrow my choices much faster.
2. Check Fitment for the Jeep TJ
Fitment was one of the biggest things I paid attention to. A radiator might be great on paper, but if it does not fit the TJ correctly, it becomes a headache. I looked for radiators specifically designed for the Jeep TJ or for LS swap applications in a TJ chassis.
I also checked:
- Overall width and height
- Core thickness
- Inlet and outlet location
- Clearance for hoses, fans, and accessories
- Mounting points or included brackets
For me, a direct-fit or swap-specific radiator saved time and avoided unnecessary fabrication.
3. Choose the Right Cooling Capacity
An LS engine can produce more heat than the original TJ engine, so I wanted a radiator with enough cooling capacity. I looked at core size, row count, and material quality. A larger aluminum radiator with a good core design usually gave me better confidence for both highway driving and slow trail use.
I learned not to focus only on size. Good cooling also depends on:
- Core efficiency
- Airflow through the grille
- Fan performance
- Proper shrouding
In my experience, a well-designed radiator with the right fan setup performed better than a bigger radiator installed poorly.
4. Look for Aluminum Construction
Most of the radiators I considered were aluminum, and that made sense to me. Aluminum radiators are usually lighter, dissipate heat well, and are popular for LS swaps. I preferred all-aluminum construction because it often felt more durable for off-road conditions than cheaper mixed-material options.
I also checked weld quality and tank design. Clean welds and sturdy end tanks gave me more confidence that the radiator would hold up over time.
5. Make Sure It Matches Your Fan Setup
My fan choice affected my radiator choice more than I expected. Some radiators are designed around electric fans, while others leave room for mechanical fans. Since LS swaps in a TJ often use electric fans, I made sure the radiator had enough clearance and proper shrouding support.
I looked for:
- Fan shroud compatibility
- Space for single or dual electric fans
- Thermostatic fan switch options
- Enough clearance from water pump pulleys and accessories
If the fan and radiator do not work together, cooling problems usually show up fast.
6. Pay Attention to Hose Connections
I always checked the inlet and outlet locations before buying. Some LS swap radiators have hose fittings that line up better with the LS water pump and thermostat housing, while others may require custom hoses or adapters.
For me, the best radiator was the one that reduced the amount of custom plumbing I had to do. That saved time and helped me avoid leaks.
7. Consider Transmission Cooling
If my TJ had an automatic transmission, I wanted a radiator with a built-in transmission cooler or room for an external cooler. LS swaps can generate a lot of heat, and transmission temperature matters
Final Thoughts
I’ve found that choosing the right Jeep TJ LS swap radiator comes down to matching cooling capacity, fitment, and build quality to my specific swap setup. My main takeaway is that a well-designed radiator can make the difference between a reliable daily driver and constant overheating issues. I always look for a radiator that supports my engine’s needs while still fitting cleanly in the TJ’s limited space. In the end, investing in the right cooling setup saves me time, money, and frustration.
Author Profile
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Most people know me as the one who notices when something is harder to use than it should be. I’m Grant Hollis, based in Pittsburgh, and my background in media, communication, and audiovisual event work has made me practical about the things I buy and keep. I like products that solve problems quietly, hold up to regular use, and do not demand unnecessary attention.
Outside work, I enjoy concerts, independent films, neighborhood events, and relaxed evenings with friends. On deptstudios.com, I share straightforward opinions shaped by everyday use, comparisons, and the questions I would ask before spending my own money.
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