Tru Cool L7B Transmission Cooler

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The Tru Cool L7B  is one of the smaller transmission coolers within the Tru Cool LPD (low pressure drop) line of trans coolers.  The L7B is built with a stacked plate design that measures 5 3/4″ x 11″ x 1 1/2″, making it a great option to improve cooling where space is limited .

Like with most stacked plate trans coolers, drivers  can expect to see a significant drop in transmission fluid temperatures.  The combination of it having a highly efficient stacked plate construction and its overall size help keep transmission fluid cool in even the most extreme conditions.

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Engine Oil Cooler...image Tru-Cool L7B $113.99

Tru Cool L7B Specs

Tru Cool L7B Transmission Cooler - Transmission Cooler Guide

The Tru Cool L7B features a highly durable black aluminum construction with efficient fluid flow through the body for maximum cooling. With its 48 rows of cooling, the L7B does a phenomenal job at keeping transmission temperatures in check.

It uses 1/2″ NPT threads, which allows for the use of 6 or 8 an lines and fittings for a more secure fit and greater fluid capacity.

Cooler Dimensions: 5 3/4″ x 11″ x 1 1/2″

Cooler Type: Stacked Plate

Cooling Rows: 24

GVW: n/a

BTU Rating: 15,000

Fitting Size: 1/2″ NPT

Highlighted Features
  • Plate and Fin Core type
  • Item Package Dimension: 13.5L x 11.25W x 2.5H inches
  • Item Package Weight – 2.27 Pounds
  • Item Package Quantity – 1

Tru Cool Low Pressure Drop System

Similar to other Tru Cool transmission coolers, the L7B utilizes a low pressure drop design that allows for more efficient cooling. The colder automatic transmission fluid is, the thicker it is in viscosity.

This causes the fluid to not flow through the cooler as efficiently as possible, so a passive bypass is built into the cooler to allow the thicker fluid to flow as normal. This thermal bypass is located in the first rows of the cooler.

As the fluid gets warmer, it will start to efficiently flow through the rest of the cooler to keep temperatures as low as possible.  This allows for optimal heat transfer and improved protection against lube system failure. More information about Tru Cool’s low pressure drop system can be found here.

tru cool transmission coolers low pressure drop - Transmission Cooler Guide

Recommended Uses

  • light Towing & Hauling
  • Daily Driven Trucks & Suv’s
  • Performance Oriented Cars, Trucks & SUV’s

Based on the size of the Tru Cool L7B, this cooler would be an excellent choice for drivers who demand high cooling efficiency.  Many truck owners who tow or haul heavy loads can utilize this cooler to help better control trans fluid temps.

With how great this cooler is when it comes to keeping temperatures in a safe range, it’s easy to understand why this is a great option for mild truck or SUV needs.  The Tru Cool L7B is a great transmission cooler for drivers who need improved cooling in mild applications.

Tru Cool L7B Pros & Cons


  • Stacked Plate Design
  • Tru Cool’s Low Pressure Drop (LPD)
  • Decent Size & Capacity
  • 1/2″ NPT Fittings


  • May Be Hard To Fit In Some Vehicles


Overall, the Tru Cool L7B is certainly a great option for mild use trucks, SUV’s, and performance oriented cars that need increased transmission fluid cooling.  With its compact size and 15,000 BTU rating, this cooler is certainly capable of handling plenty.

Despite the fact that this cooler does not include hardware or fittings to compete the installation, the cost of the cooler will allow you to purchase everything you need. We highly recommend utilizing either -6an or -8an lines with this cooler to get as much cooling capacity as possible while creating a very secure, leak free connection.

  • Plate and Fin Core type
  • Item Package Dimension: 13.5L x 11.25W x 2.5H inches
  • Item Package Weight – 2.27 Pounds
  • Item Package Quantity – 1