International 4400 front turn signal bulb size 3157NA and rear turn signal bulb size 3157 are specified in this replacement chart. The chart covers vehicle production years from 2011 to 2018 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The International 4400 uses the 3157NA bulb for the front turn signal across the 2011-2018 model years.
The rear turn signal on the International 4400 uses the 3157 bulb across the same 2011-2018 model year span.
Both the 3157NA and 3157 are dual-filament T25 wedge bulbs rated at 12V with a 27W/7W power draw, where the higher wattage filament serves the turn signal function and the lower wattage filament serves a secondary lighting function.
The 3157NA and 3157 share the same ANSI designation family and physical T25 wedge base, meaning they are mechanically interchangeable in terms of socket fitment.
The distinguishing characteristic of the 3157NA is its natural amber glass envelope, which produces an amber output without relying on a colored lens or reflector housing to filter the light.
The standard 3157 used at the rear has a clear glass envelope, meaning the amber turn signal color in that position is produced by the vehicle's lens or housing rather than the bulb itself.
Substituting a 3157 for a 3157NA in the front position may result in a non-amber output if the front housing relies on the bulb's glass color rather than a tinted lens to meet amber signal requirements.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating compliance with North American automotive lighting regulations.