Ram 1500 Classic front turn signal bulbs use 3157NA size while rear turn signals require either 7440 or 3057 bulb sizes for replacement. The chart covers 2019 to 2023 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 Ram 1500 Classic uses three distinct turn signal bulb types across its front and rear positions: the 3157NA, the 7440, and the 3057, all of which conform to ANSI standards recognized in both the United States and Canada.
The 3157NA is a dual-filament wedge bulb in the T25 form factor, rated at 12V with a 27W high filament and a 7W low filament. Its natural amber glass produces a yellow-tinted output directly from the bulb itself, without relying on a colored lens or housing.
The 3057 shares the same T25 form factor and 12V, 27W/7W dual-filament configuration as the 3157NA, but it lacks the natural amber glass coating, making the two bulbs electrically similar yet optically distinct.
The 7440 is a single-filament wedge bulb in the smaller T20 form factor, rated at 12V and 21W. Because it carries only one filament, it is not interchangeable with dual-filament T25 bulbs such as the 3157NA or 3057.
The Ram 1500 Classic front turn signal position uses the 3157NA for the 2019-2023 model years, though the 2019 fitment applies specifically to vehicles without projector-type headlamps.
The rear turn signal position shifts between two different bulb types depending on the model year. The 2023 model uses the single-filament 7440, while the 2019 model uses the dual-filament 3057, again limited to vehicles without projector-type headlamps.
The T20 and T25 designations refer to wedge base sizes that are physically incompatible with one another, meaning the 7440 cannot be seated in a socket designed for the 3157NA or 3057 without modification.
The projector-type headlamp condition noted for the 2019 model year affects both the front and rear turn signal bulb fitment, indicating that vehicles equipped with that headlamp configuration follow a separate specification not reflected in these entries.