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What size is the fill plug on a Tacoma transmission?

The fill plug on a Toyota Tacoma transmission is typically a 3/8-inch plug. This size is standard across most Tacoma models and transmission types, allowing for easy access and maintenance of the transmission fluid.


Understanding the Tacoma Transmission Fill Plug


The fill plug on a Tacoma transmission serves an important purpose. It provides a way to check the transmission fluid level and add more fluid if necessary. The plug is located on the side of the transmission housing, making it easily accessible for routine maintenance.


The size of the fill plug is crucial, as it needs to be the right fit to ensure a secure seal and prevent leaks. Toyota has standardized the fill plug size across Tacoma models to make it easier for owners and mechanics to service the transmission.


Checking and Maintaining Tacoma Transmission Fluid


To check the transmission fluid level on a Tacoma, you'll need to locate the fill plug, typically on the driver's side of the transmission. Here are the steps to properly check and maintain the fluid level:



  • Park the Tacoma on a level surface and apply the parking brake.

  • Locate the 3/8-inch fill plug on the side of the transmission housing.

  • Using the appropriate wrench or socket, carefully remove the fill plug.

  • Check the fluid level - it should be just below the bottom of the fill plug hole.

  • If the fluid level is low, add the recommended transmission fluid through the fill plug hole until it starts to drip out.

  • Replace the fill plug and tighten it securely.


Regularly checking and maintaining the transmission fluid level is crucial for the long-term health and performance of your Tacoma's transmission. Consult your owner's manual for the recommended fluid type and change interval.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.