What Size Are Transmission Cooler Lines?

Published by Dustin Babich on

Transmission cooler lines typically come in two sizes: 5/16 inch and 3/8 inch. Transmission cooler lines are an integral part of an automatic transmission system.

They help to keep the transmission fluid at the correct temperature for optimal performance and longevity. The cooler lines come in two different sizes, 5/16 inch and 3/8 inch. The size of the transmission cooler lines depends on the type of vehicle, the size of the transmission, and the amount of fluid needed to be cooled.

It is important to know the correct size of the transmission cooler lines when replacing or repairing them to ensure proper transmission function. In this article, we will explore the importance of transmission cooler lines and how to determine the correct size for your vehicle.

Frequently Asked Questions For What Size Are Transmission Cooler Lines

What Are Transmission Cooler Lines?

Transmission cooler lines are hoses that carry transmission fluid to the radiator for cooling.

How Do You Measure Transmission Cooler Lines?

To measure transmission cooler lines, use a tape measure or caliper to determine the inside diameter.

What Size Are Most Transmission Cooler Lines?

Most transmission cooler lines are either 5/16 inch or 3/8 inch in diameter. Check your vehicle’s manual to determine the correct size.


Determining the size of your transmission cooler lines is crucial for preventing any damage to your vehicle’s transmission system. With the right tools and careful measuring, you can accurately find the correct size of the cooler lines. Remember to take note of the type of transmission you have and its specific requirements.

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Dustin Babich
Categories: Knowledgebase

Dustin Babich

Dustin Babich

As the passionate author behind Automotivesimple.com, Dustin Babich is a knowledgeable expert in all things automotive. With a deep understanding of car tools, equipment, engines, and troubleshooting techniques, Dustin Babich shares invaluable insights, practical tips, and effective solutions to empower readers in overcoming car-related challenges.


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