Ignition Coil & Iridium Spark Plugs for Dodge Ram 1500 2500 3500 (2003-2005) 5.7L V8

Enhanced Ignition Coil & Iridium Spark Plug Kit for 2003-2005 Dodge Ram 1500, 2500, 3500

Restores lost ignition performance and cures persistent misfire codes by providing a stable, high-voltage spark for the 5.7L Hemi V8.

The Stock Ram 1500, 2500, 3500 Ignition Weakness

The early 5.7L Hemi V8 utilizes an ignition system where factory coil packs and standard spark plugs are subjected to extreme thermal cycling on the cylinder bank. Over time, the OEM coil epoxy degrades, leading to micro-cracks that allow voltage leakage to the cylinder head rather than across the plug gap. This dielectric breakdown results in hard starting, rough idling, hesitation under load, and persistent P0300-series misfire codes. Furthermore, standard factory plugs suffer from rapid electrode wear, widening the gap and increasing the electrical resistance required to bridge the spark, eventually overworking the coil until complete failure.

The Engineering Solution

This comprehensive ignition overhaul directly addresses factory shortcomings by upgrading both coil energy output and spark plug durability. The replacement coils feature high-grade magnetic steel cores and internal copper wire windings that deliver superior thermal resistance and consistent voltage delivery, even under severe towing loads. The robust epoxy potting ensures maximum dielectric strength, completely eliminating voltage bleed. Paired with this kit are 16 premium Iridium spark plugs, catering perfectly to the Hemi’s dual-spark-plug cylinder head design. Iridium’s exceptionally high melting point allows for an ultra-fine center electrode, requiring less voltage to fire while generating a significantly hotter spark. This promotes complete combustion, burning off carbon deposits to prevent fouling and restoring factory fuel efficiency and throttle response.

Technical Specifications

Compatibility

• 2003-2005 Dodge Ram 1500 5.7L V8
• 2003-2005 Dodge Ram 2500 5.7L V8
• 2003-2005 Dodge Ram 3500 5.7L V8

The Dodge Durability Standard

Dodge trucks are engineered for rigorous towing and hauling. This ignition overhaul ensures your Hemi maintains the reliable, under-load pulling power and smooth torque delivery required for heavy-duty applications without the risk of a cylinder drop-out.

Common Questions

Will this ignition coil and spark plug kit fit my 2004 Dodge Ram 1500 with the 5.7L Hemi?
Yes, this kit is a direct fit for 2003-2005 Dodge Ram 1500, 2500, and 3500 trucks equipped with the 5.7L Hemi V8 engine.

Will this fit a 2006 Dodge Ram 5.7L V8 truck?
This kit is built specifically for the 2003-2005 5.7L Hemi V8 ignition architecture using 8 UF378-style coils. Starting in 2006, the 5.7L Hemi switched to the UF504 coil-on-plug design.

How many spark plugs are included in the box?
The kit includes 16 iridium spark plugs alongside the 8 replacement ignition coils, matching the 2-plug-per-cylinder design of the 5.7L Hemi V8 cylinder heads.

Which factory part numbers does this kit replace?
This set replaces OEM and aftermarket interchange numbers UF378, 5C1409, 56028394AB, 56028394AC, 56028394AD, C1414, UF505, UF428, 6987, and ZFR6F-11G.

Does installing these coils and plugs require any wiring modifications?
The coils and iridium spark plugs are direct-fit replacements engineered to bolt onto the factory cylinder bank and plug directly into your stock wiring harness.