The Lexus GX460 front and rear turn signal bulbs both use the 7440NA size for replacement. The chart covers bulb size specifications across a 2010 to 2023 range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440NA is the sole bulb type specified for both the front and rear turn signals of the Lexus GX460 across the 2010-2023 model years, with the exception of 2020, which is not included in the specifications.
The 7440NA is a single-filament wedge bulb built on the T20 platform, operating at 12 volts and drawing 21 watts, which places it in a common wattage range for incandescent turn signal applications.
The "NA" suffix in the 7440NA designation indicates natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-coated or clear bulb paired with a colored lens.
The 7440NA carries ANSI standardization recognized in both the United States and Canada, meaning the bulb conforms to a defined set of electrical and physical parameters shared across compliant manufacturers.
Because the 7440NA uses a single filament, it serves a dedicated signaling function and is not a dual-purpose bulb combining turn signal and brake or running light duties in a single unit.
The T20 wedge base of the 7440NA is not compatible with bayonet or indexed-base sockets, so substitution with physically similar bulbs from different base families would not result in a proper fit in the GX460's housings.
The standard 7440, which shares the same T20 wedge base and 21-watt rating, uses a clear glass envelope rather than natural amber glass, making it a distinct part from the 7440NA despite the near-identical designation.
The uniform use of the 7440NA across both front and rear positions means a single bulb type covers all four turn signal sockets on the GX460 throughout the listed model range.