Ignition Coil & Iridium Spark Plugs for Ram 2500 3500 4500 5500 (2011-2022) 5.7L 6.4L V8

High-Output Ignition Coil & Iridium Spark Plugs for 2011-2022 Dodge, Ram 2500, 3500, 4500, 5500 (5.7L / 6.4L HEMI V8)

Designed to restore combustion efficiency and maximize voltage output under heavy loads. This complete 8-coil and 16-plug package replaces degrading OEM ignition components to eliminate misfires, stabilize idle, and optimize fuel burn across the RPM range.

The Stock Ram HEMI Ignition Degradation

The 5.7L and 6.4L HEMI V8 engines utilize a dual-spark plug system that demands consistent, high-voltage energy delivery. Over prolonged heat cycling, heavy towing, and extended idle times typical of heavy-duty truck usage, the factory ignition coils suffer from primary winding resistance breakdown and epoxy insulation cracking. Simultaneously, standard copper or platinum spark plugs experience rapid electrode erosion under high cylinder pressures. This progressive wear leads to parasitic voltage leaks, weak spark propagation, intermittent misfires under load, and reduced towing efficiency. The resulting incomplete combustion directly penalizes fuel economy and low-end torque output.

The Engineering Solution

This comprehensive ignition overhaul directly addresses the HEMI heat-soak and voltage drop issues. The included performance ignition coils are engineered with advanced conductive copper windings and high-dielectric epoxy resin, ensuring maximum thermal shock resistance and a stable, high-voltage output even during sustained high-load towing operations. Paired with 16 performance iridium spark plugs, the system is designed to ensure a highly concentrated spark arc. The ultra-fine iridium center electrodes require less voltage to fire, significantly reducing the load on the ignition coils while ensuring complete fuel atomization. This combination yields a more complete fuel burn, restoring factory horsepower and torque metrics, eliminating rough idles, and providing superior throttle response in heavy-duty applications.

Technical Specifications

Compatibility

• 2011-2018 Ram 2500 (5.7L V8) & 2014-2022 Ram 2500 (6.4L V8)
• 2011-2018 Ram 3500 (5.7L V8) & 2014-2022 Ram 3500 (6.4L V8)
• 2014-2022 Ram 4500 (6.4L V8)
• 2014-2022 Ram 5500 (6.4L V8)

The Ram Heavy Duty Standard

Engineered for the rigorous demands of the modern job site and heavy towing circuits. Upgrading to a high-output iridium ignition system ensures long-term reliability, maximum pulling power, and consistent combustion stability no matter how heavy the payload.

Common Questions

Will this ignition kit fit my 2016 Ram 2500 with the 6.4L HEMI V8?
Yes. This complete ignition kit fits 2011-2018 Ram 2500 and 3500 models with the 5.7L HEMI V8, as well as 2014-2022 Ram 2500, 3500, 4500, and 5500 models equipped with the 6.4L HEMI V8.

What is included in the box?
The package includes 8 high-output ignition coils and 16 iridium spark plugs—enough to service all 8 cylinders on the dual-plug HEMI V8 engine.

Why does this kit come with 16 spark plugs for a V8 engine?
The 5.7L and 6.4L HEMI V8 engines use a dual-spark ignition design with two spark plugs per cylinder, where each of the 8 ignition coils fires two plugs.

Which factory part numbers do these ignition coils replace?
These coils are direct replacements for part numbers UF-504, CUF504, 56029129AA, and 68060346AA.

Will this kit work on a 6.7L Cummins diesel Ram?
This ignition coil and spark plug package is built specifically for gasoline 5.7L Eagle and 6.4L Apache HEMI V8 engines.