NGK 3403 Spark Plug

NGK G-Power Spark Plug 3403 Overview

NGK G-Power Spark Plug 3403 is built for drivers who want OE-style ignition performance with a platinum-tipped center electrode and copper core construction. It is a direct replacement spark plug for a wide range of Ford, Chevrolet, GMC, Buick, Cadillac, and Lincoln applications, including many high-mileage trucks, vans, and passenger vehicles.

The G-Power line focuses on dependable ignition performance and original-equipment standards. Part number 3403 is engineered with a tapered seat, 14 mm thread diameter, 5/8 hex, 0.708 inch reach, and a 0.060 inch pre-gap for applications that call for this specification.

• Platinum center electrode tip for stable spark delivery
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with trapezoid tip design
• 5000 ohm resistance for ignition system compatibility
• OE-style tapered seat and standard ground configuration
• Direct replacement for many Ford F-150, Ford Explorer, Chevrolet Silverado 1500, and GMC Sierra 1500 applications

Product Details

NGK 3403, also identified as TR55GP, is a G-Power spark plug designed to support consistent combustion across a broad range of domestic vehicles. The platinum tip helps maintain firing performance over time, while the copper core and nickel ground electrode support heat control and reliable operation. This makes it a practical choice for drivers searching for an NGK spark plug 3403 replacement for Ford F-150 1997-2010, Chevrolet Silverado 1500 1999-2013, or GMC Sierra 1500 1999-2013 service needs.

This part cross-references Bosch 3983 and Autolite AP605 for the same application.

Common Problems This Part Can Address

• Rough idle caused by worn spark plugs
• Hard starting from weak ignition output
• Misfire conditions related to plug wear or gap drift
• Reduced throttle response from inconsistent spark delivery
• Maintenance intervals on vehicles requiring OE-style replacement plugs

Installation Notes and Fitment Tips

Verify the vehicle-specific gap before installation. This plug is listed with a 0.060 inch pre-gap, but several confirmed applications call for different gap settings, including 0.054 inch, 0.052 inch, 0.050 inch, or 0.044 inch depending on the vehicle. Always confirm the service specification for the exact year, make, and model before installation.

• Fits 1997-2010 Ford F-150, N/A
• Fits 1999-2013 Chevrolet Silverado 1500, N/A
• Fits 1999-2013 GMC Sierra 1500, N/A
• Fits 1991-2011 Ford Crown Victoria, N/A
• Fits 2006-2011 Buick Lucerne, N/A
• Fits 2006-2011 Cadillac DTS, N/A
• Fits 2001-2008 Ford Escape, N/A
• Fits 2005-2009 Chevrolet Equinox, N/A
• Fits 2003-2014 Ford E-150, N/A
• Fits 2003-2014 Ford E-250, N/A
• Fits 1996-2014 Chevrolet Express 1500, N/A
• Fits 1996-2014 GMC Savana 1500, N/A

Quality Assurance

NGK is a long-established OE supplier and manufacturer with more than 80 years of automotive experience. Its North American and global manufacturing and distribution network supports consistent product availability and OE-level production standards across a wide range of ignition applications.