2018-2026 Jeep Wrangler, Gladiator JL JT 4 Row 5MM Fin, Extruded Tube Aluminum Radiator

2018–2026 Jeep Wrangler JL / Gladiator JT | 4-Row Extruded Tube Aluminum Radiator The JL and JT Raised the Bar. Your Radiator Should Too. The Wrangler JL and Gladiator JT brought a stiffer chassis, more power, and more capability to the Wrangler platform — along with a factory cooling system that was still built to a cost target rather than a performance standard. Whether you’re running a stock 3.6L Pentastar, the 2.0L turbocharged four, a lift with larger tires, a trailer behind you, or all of the above, the OEM plastic-tank radiator has limits that show up exactly when you need it most. This 4-row extruded aluminum radiator is engineered specifically for the 2018–2026 Wrangler JL and Gladiator JT with the 3.6L Pentastar or 2.0L turbo four. It drops directly into the factory location — no modification, no adapter brackets, and full compatibility with the stock fan, A/C condenser, and transmission cooler. The tube is the differentiator. Most aftermarket aluminum radiators are built from tubes formed by rolling and joining a flat strip of aluminum, which creates a longitudinal seam along every tube wall. That seam is a stress point, and under the thermal cycling a Wrangler or Gladiator sees in real use — heat soaking on the trail, rapid cool-down, heat soaking again — it’s where cracks start and leaks develop. Most brands TIG weld only the end tanks, leaving that joint in the core untouched. Fluidyne uses extruded aluminum tubes — formed as a single continuous extrusion with no seam along the tube wall. That failure point doesn’t exist. Every tank, fitting, and seam is then finished with premium TIG welds throughout. The result is a radiator that is genuinely heavy duty, built to last, and engineered to be the last one you ever put in this Jeep. 5mm fin pitch. Most aftermarket radiators use 8mm. That’s a 60% increase in heat sink surface area. Fin pitch determines how much aluminum surface is exposed to airflow per square inch of core. Most aftermarket radiators use an 8mm fin pitch — Fluidyne’s JL/JT radiator uses 5mm, which increases heat sink surface area by approximately 60% over those units. For the turbocharged 2.0L in particular, which generates more heat per displacement than the naturally aspirated Pentastar, the additional surface area makes a meaningful difference under sustained load. The 4-row core combined with the 5mm pitch gives you more cooling capacity than the factory radiator within the same physical envelope — no cutting, no clearance issues, no fighting the factory shroud. Note: Fits the stock 3.6L Pentastar V6 and 2.0L turbo four. Not intended for HEMI, LS, or other engine swap applications. Fitment: 2018–2026 Jeep Wrangler JL / Gladiator JT | 3.6L Pentastar V6 & 2.0L Turbo | Crossflow | 22″ core