2003-2009 Dodge Ram 2500 3500 5.9L, 6.7L Cummins Diesel 3 Row Extruded Tube Aluminum Radiator

2003–2009 Dodge Ram 2500/3500 5.9L & 6.7L Cummins | 3-Row Extruded Tube Aluminum Radiator

Built for the Third-Gen Cummins — From the 5.9 HO to the First-Year 6.7.

The 2003–2009 Ram 2500 and 3500 span one of the most popular generations in diesel truck history. This range covers the high-output 5.9L ISB, the final 600-lb-ft 5.9 in 2007, and the first two years of the 6.7L Cummins — all engines that make serious torque and put equally serious thermal demands on the cooling system. The factory plastic-tank radiator was never built to handle what tuners, sled pullers, and heavy haulers actually put these engines through.

This 3-row extruded aluminum radiator is engineered specifically for the 2003–2009 Ram 2500 and 3500 with the 5.9L or 6.7L Cummins. It drops directly into the factory mounting locations with no cutting, no drilling, and no fabrication required.

Done replacing radiators? So are we.

Most aftermarket aluminum radiators — including well-known brands — TIG weld only the end tanks and rely on brazed joints where the core meets the header. That junction is exactly where they crack and leak under diesel heat cycling and vibration. It’s not a matter of if — it’s when.

Fluidyne eliminates that failure point entirely with a fully extruded aluminum core — a single-piece design with no brazed tube-to-header joints anywhere in the core. Every tank, fitting, and seam is 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 truck.

Three rows of dense, extruded core. More than enough for the third-gen.

The extruded 3-row core delivers more effective heat rejection than conventional 3 or even 4-row brazed-tube designs, because every tube is formed from solid aluminum rather than folded and joined sheet. With a 27″ core height — significantly taller than earlier Cummins applications — this unit has the surface area to keep temps stable under sustained towing, mountain grades, or high-boost builds. Includes a billet aluminum radiator cap.

Fitment: 2003–2009 Dodge Ram 2500 / Ram 3500 | 5.9L Cummins & 6.7L Cummins | Crossflow | 27″ core