The Dodge W350 front turn signal uses bulb sizes 2057NA, 2057, or 1157, while the rear turn signal requires either 2057 or 1157 bulb sizes. The replacement chart covers vehicle production years from 1981 to 1993 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 Dodge W350 front and rear turn signals rely on three bulb types across the 1981-1993 model range: the 1157, 2057, and 2057NA, all of which follow ANSI standards applicable in both the United States and Canada.
All three bulb types share the BAY15d bayonet base, meaning the physical mounting interface is identical across all of them. This base style uses two pins offset at different heights to ensure correct orientation during installation.
The 1157 is the most frequently specified bulb across both front and rear positions on the Dodge W350, appearing in the majority of model years in the dataset. It operates at 12V with a dual-filament output of 21W on the high-intensity filament and 5W on the low-intensity filament.
The 2057 and 2057NA are described as brighter variants of the 1157. Both operate at 12V with filament ratings of 26.9W and 8W, representing a higher wattage output on both filaments compared to the 1157.
The 2057NA carries natural amber glass, which produces a colored output directly from the bulb itself rather than relying on a tinted lens to achieve the amber turn signal appearance. The standard 2057 does not carry this amber glass designation.
Because the 1157 and 2057 share the same BAY15d base, they are physically interchangeable in terms of fitment. However, substituting one for the other results in a different wattage output, which may affect brightness and compatibility with the vehicle's electrical system.
The front turn signal position on the Dodge W350 used the 1157 from 1981-1990, with the exception of 1983, which specified the 2057. The 1991 and 1993 model years specified the 2057NA, while 1992 specified the standard 2057.
The rear turn signal position used the 1157 for most of the production span, with 1984 specifying the 2057, and 1992-1993 also specifying the 2057. The 1991 rear position returned to the 1157.
The front and rear turn signal bulb specifications do not always match within the same model year. For example, the 1991 Dodge W350 specifies a 2057NA for the front position and a 1157 for the rear, making position-specific verification necessary when sourcing replacements.
The dual-filament design present in all three bulb types serves two functions within a single housing, with the higher-wattage filament typically used for the active turn signal flash and the lower-wattage filament used for a steady parking or running light function.