The Dodge Ram 3500 Van uses 3457 and 3157 bulb sizes for front turn signals and 3157 size for rear turn signals. The replacement chart covers 1999 to 2003 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Dodge Ram 3500 Van uses two bulb types across its front and rear turn signal positions for the 1999-2003 model years: the 3457 and the 3157.
Both the 3457 and 3157 are ANSI-standardized bulbs recognized in the United States and Canada, and both share the T25 wedge form factor with identical electrical ratings of 12V and a dual-wattage output of 27W/7W.
The dual-filament design of both bulbs allows a single housing to serve two brightness levels, which is typical in automotive applications where one filament handles running light duty and the other handles the higher-intensity turn signal or brake signal function.
Despite their near-identical specifications, the 3457 and 3157 are distinct part numbers and are not confirmed as interchangeable within these specifications.
The front turn signal position on the Dodge Ram 3500 Van uses the 3457 for the 1999-2001 and 2003 model years, while the 2002 model year uses the 3157 in that same position.
The rear turn signal position on the Dodge Ram 3500 Van uses the 3157 consistently across all listed model years from 1999-2003.
The 2002 model year is the only year in which the front and rear turn signal positions share the same bulb type, both using the 3157.
For all other listed model years outside of 2002, the front and rear turn signal positions on the Dodge Ram 3500 Van require different bulb types, with the 3457 at the front and the 3157 at the rear.