Ignition Coil & Iridium Spark Plugs & Wire for GMC Sierra 1500 2500 2500HD 3500 (1999-2007) 4.8L 5.3L 6.0L

Heavy-Duty Ignition Coil, Wire, & Iridium Plug Kit for 1999-2007 GMC Sierra

High-Output Ignition Restoration: Complete secondary ignition overhaul kit engineered to eliminate misfires, rough idle, and spark breakdown under heavy load for GM Vortec V8 trucks.

The Stock Sierra Thermal Breakdown Problem

Factory ignition coils and spark plug leads on GMT800-platform trucks are mounted directly above the exhaust manifolds, subjecting them to intense heat soak. Over extended mileage, the original epoxy potting in OEM round coils cracks internally, leading to secondary winding insulation failure and voltage leakage. Concurrently, factory resistance-core wires deteriorate under thermal stress, and standard spark plug gaps erode, causing hesitation, power loss, and unburned fuel under heavy towing conditions.

The Engineering Solution

This service pack features high-output D585/UF262-style round coils with dense epoxy-sealed internal windings and silicone boots for maximum dielectric resistance. Paired with stranded copper-core 8mm silicone spark plug wires fitted with stainless steel heat-shielded terminals and fine-wire iridium spark plugs (41-962), this kit provides low-resistance spark delivery, resists dielectric breakdown up to extreme engine-bay temperatures, and maintains precise spark gaps over extended service intervals.

Technical Specifications

Compatibility

• 1999-2007 GMC Sierra 1500: 4.8L, 5.3L, 6.0L V8 (Round UF262/D585 Coil Type Only)
• 1999-2007 GMC Sierra 1500 Classic: 4.8L, 5.3L, 6.0L V8
• 1999-2000 GMC Sierra 2500: 5.3L, 6.0L V8
• 2001-2007 GMC Sierra 2500 HD Classic: 6.0L V8
• 2001-2007 GMC Sierra 3500: 6.0L V8
• 2001-2007 GMC Sierra 3500 Classic: 6.0L V8

The GMC Heavy-Duty Standard

Engineered specifically to withstand the relentless demands of high-payload hauling, prolonged idling, and severe thermal cycles, this ignition assembly delivers reliable combustion stability to keep your Vortec workhorse performing at full capacity.