John Deere Gator TX 4x2 front turn signal bulbs use 3457 size while rear turn signal bulbs use P21W size. The replacement chart covers 2010 to 2017 production years with bulb specifications for each model year.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The John Deere Gator TX 4x2 uses two distinct bulb types across its front and rear turn signal positions for the 2010-2017 model years.
The 3457 bulb is a dual-filament wedge type in the T25 form factor, rated at 12V with a 27W/7W output split between its two filaments, and it follows the ANSI standard used in the United States and Canada.
The front turn signal on the Gator TX 4x2 takes the 3457 bulb across all 2010-2017 model years.
The P21W is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, and it conforms to the ECE standard used in Europe and internationally.
The rear turn signal on the Gator TX 4x2 takes the P21W bulb across all 2010-2017 model years.
The 3457 and P21W bulbs are not interchangeable with each other. The 3457 uses a wedge base while the P21W uses a BA15s bayonet base, making the two physically incompatible regardless of their shared 12V operating voltage.
The dual-filament nature of the 3457 bulb means it is capable of serving two lighting functions from a single housing, which is a common arrangement in combined turn and parking light assemblies.
The single-filament P21W at the rear is dedicated to one lighting function per socket, consistent with its use as a standalone turn signal bulb.