GBTAD Ignition Coil Pack Set for Chevy GMC 1999–2007 — 8 Square Coils with Iridium Wire Harness, OEM Fit

GBTAD’s Set of 8 square ignition coil packs with an iridium spark plug wire harness is a complete ignition upgrade designed to restore reliable spark delivery and reduce misfires on compatible 4.8L–6.0L V8 GM engines.

If your Chevy Silverado, Tahoe, Suburban, Avalanche or GMC Sierra/Yukon/Escalade from model years 1999–2007 is showing rough idle, intermittent misfires, or a check engine light linked to ignition faults, this kit gives you all eight coils and a matching high-quality wire harness to replace worn components in one service. The components are engineered to meet OEM fit while using higher-grade materials for improved conductivity and longer service life.

Which vehicles and engines will this kit fit?

This GBTAD kit is built for a range of GM trucks and SUVs with small‑block V8 engines. It covers many 4.8L, 5.3L and 6.0L applications across model years roughly 1999 through 2007—double-check engine codes before ordering.

• Chevrolet: Silverado (1999–2007), Avalanche (2002–2006), Suburban (2000–2006), Tahoe (2000–2006), Express (2003–2006).
• GMC: Sierra 1500 (1999–2007), Yukon (2000–2006), Savana (2003–2005).
• Compatible engine displacements: 4.8L, 5.3L and 6.0L V8.

What performance or durability benefits does this set provide?

The coils and wires are manufactured with improved materials to deliver steadier spark and reduced electrical losses compared with aging stock parts. That translates to fewer misfires, more consistent combustion and system reliability under typical driving conditions.

• High-density epoxy and aerospace-grade copper in coils for improved conductivity.
• Iridium-grade spark plug wire connections for stable high-voltage transfer.
• Engineered to match OEM fitment for a straightforward replacement.

How difficult is installation and what parts are included?

Installation is a direct-replacement procedure for technicians or experienced DIYers familiar with GM V8 ignition layouts. The package supplies eight square-style ignition coil packs plus one matched spark plug wire harness—everything you need to replace the ignition assembly on one bank or the full engine, depending on your problem.

• Includes 8 coil packs (compatible with part numbers UF271, D581, 12558693, 12570553, 19299585, 41962, APP5243).
• One iridium spark plug wire harness sized to fit specified V8 routing.
• Plug-and-play connectors and standard mounting points for OEM-style installation.

Will this solve check engine lights and misfires?

Replacing failed or degraded coils and wires often clears ignition‑related diagnostic trouble codes and reduces misfire counts, but root-cause diagnostics are advised. If ignition components are the source, this kit commonly restores normal operation; if another issue exists (fuel, compression, sensors), additional repairs may be required.

• Addresses ignition-origin misfires, weak spark and related drivability symptoms.
• Helps eliminate intermittent faults caused by cracked coils or corroded wire terminals.
• Always scan codes and test coils/wires prior to replacing to confirm failure mode.

Who is this for: This complete set is aimed at owners and mechanics servicing late‑1990s to mid‑2000s GM full‑size trucks and SUVs who want a reliable, OEM‑fit replacement with upgraded materials. It suits fleet technicians, performance-minded DIYers, and anyone replacing multiple ignition components at once to restore engine smoothness and dependability.