2007-2018 Jeep wrangler JK 4 Row 5MM Fin Extruded Tube Aluminum Radiator

High Performance Replacement Radiator 2007-2016 Jeep Wrangler JK — 3.6L Pentastar & 3.8L V6 OVERVIEW The stock Jeep Wrangler JK radiator was built to a cost target, not a performance standard. Under sustained off-road use, towing, or high-ambient temperatures, it shows — coolant temps climb, and the thin-walled tubes that the OEM core relies on are the first thing to give. The Fluidyne JK High Performance Replacement Radiator is a direct swap for the factory unit on both the 3.6L Pentastar and 3.8L V6, built with extruded aluminum tubes and a 5mm high-density fin pitch. The result is a radiator that fits exactly like stock and outperforms it in every condition that matters. KEY DIFFERENTIATORS Extruded Aluminum Tubes Formed as a single continuous extrusion — no seams, no joints along the tube wall. Conventional tube construction creates stress points at every joint; Fluidyne’s extruded tubes eliminate that failure mode entirely. 5mm Fin Pitch Tighter fin spacing increases surface area in contact with airflow, accelerating heat transfer per square inch of core. More cooling capacity within the same envelope as the factory radiator. True Direct Fit Designed to the OEM envelope — accommodates the stock JK radiator fan, A/C condenser, and transmission cooler with no fabrication, no adapter brackets, and no modifications. Full Aluminum Construction Tanks, core, and extruded tubes are all aluminum — minimizing corrosion potential and reducing weight compared to the factory unit’s mixed-material construction. WHY TUBE CONSTRUCTION MATTERS Most radiator failures aren’t caused by the fins or tanks — they’re caused by the tubes. Conventional tube construction creates stress points along every joint. Under the thermal cycling of regular off-road use — heat soaking on the trail, rapid cool-down, repeated over and over — those stress points are where cracks initiate and leaks develop. Fluidyne’s extruded tubes have no longitudinal seam. The tube is the extrusion. There is no joint to fail. FEATURES Extruded aluminum tubes — seamless wall construction, no joints along tube length 5mm fin pitch for maximized core surface area and heat transfer Increased core volume and coolant capacity over stock JK radiator Dual-pass coolant flow — extends dwell time in the core for more effective heat extraction TIG-welded tank-to-core interface Compatible with stock JK fan, A/C condenser, and transmission cooler Fits both 3.6L Pentastar V6 and 3.8L V6 applications Includes high-pressure radiator cap and magnetic drain plug Direct fit — no modification required for 2007–2018 Wrangler JK Note: This radiator is a performance replacement for the stock JK cooling system and is compatible with both the 3.6L Pentastar V6 and the 3.8L V6. It is not intended for HEMI or other engine swap applications — see part no. RJP.JKHEMI for HEMI conversion fitment.