Full product description

<h2>High-Output Ignition Coil & Iridium Spark Plug Kit for 2004-2005 Dodge Durango</h2> <p><strong>What it Does:</strong> Replaces deteriorating OEM ignition components to restore proper combustion efficiency, eliminate engine misfires, and provide stable voltage to the 5.7L Hemi cylinder heads.</p> <h3>The Stock Durango Ignition Shortcomings</h3> <p>The factory ignition coils and standard spark plugs on the early 5.7L Hemi are highly susceptible to premature thermal degradation. Positioned directly over the exhaust manifolds, these OE components suffer from severe, repetitive heat soak. Over time, the internal insulating epoxy of the factory coils develops micro-cracks, which increases primary electrical resistance and significantly reduces secondary voltage output.</p> <p>This leads to weak spark propagation, causing rough idling, intermittent misfires under heavy load, unburned fuel washing the cylinder walls, and an active Check Engine Light. Furthermore, standard OE plugs erode rapidly, widening the spark gap and drastically overworking the ignition coils until failure.</p> <h3>The Engineering Solution</h3> <p>This comprehensive ignition overhaul directly mitigates thermal failure and voltage bleed. The upgraded ignition coils are wound with high-purity copper wire and insulated with a robust high-dielectric epoxy, amplifying spark energy and ensuring consistent voltage delivery without arcing. By pairing these coils with enhanced iridium spark plugs, the system utilizes an ultra-fine center electrode that requires less voltage to bridge the gap.</p> <p>Iridium's exceptionally high melting point maintains a precise gap over extended mileage, while its optimized heat range burns off carbon deposits efficiently to prevent fouling. The included spark plug wires ensure the Hemi's unique dual-plug waste-spark system fires in perfect sync, delivering a complete, clean burn.</p> <h3>Technical Specifications</h3> <table> <tbody> <tr> <td><strong>Fitment</strong></td> <td>2004-2005 Dodge Durango</td> </tr> <tr> <td><strong>Engine / Chassis</strong></td> <td>5.7L Hemi V8 (EZB) / HB Chassis</td> </tr> <tr> <td><strong>Stock Output</strong></td> <td>335 hp / 370 lb-ft (Approx)</td> </tr> <tr> <td><strong>Part Number</strong></td> <td>UF378, 56028394AB, 6987, ZFR6F-11G (cross-reference number; kit includes iridium plugs)</td> </tr> </tbody> </table> <h3>Compatibility</h3> <ul> <li>2004 Dodge Durango 5.7L V8</li> <li>2005 Dodge Durango 5.7L V8</li> </ul> <h3>The Dodge Heavy-Duty Standard</h3> <p>Built to handle the heavy towing and payload demands of a V8 SUV, this upgraded ignition kit restores reliable pulling power, maximizes fuel efficiency, and ensures a smooth, misfire-free idle under all load conditions.</p> <h3>Common Questions</h3> <p><strong>Will this fit my 2005 Durango 5.7L Hemi?</strong><br>Yes. It fits 2004-2005 Dodge Durango (HB) models with the 5.7L Hemi V8 (EZB).</p> <p><strong>Are spark plug wires included?</strong><br>Yes. The included wires keep the Hemi dual-plug system firing in sync.</p> <p><strong>Will it help when towing?</strong><br>Yes. It restores reliable pulling power for towing and payload with a smooth idle.</p> <p><strong>What will I notice?</strong><br>A smoother idle, cleaner burn and better fuel efficiency.</p> <p><strong>Why iridium plugs?</strong><br>The ultra-fine iridium electrode needs less voltage to fire and holds its gap over extended mileage.</p>