Finding Return Line on Toyota Tundra to Install Derale Transmission Cooler

Updated 04/22/2019 | Published 04/19/2019

Question:

I’m installing this and not sure which line is my return line.

asked by: Margie W

Expert Reply:

When installing the Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13504 you can identify the return line on your Tundra by first starting the truck and putting the transmission in drive for about 10 seconds. Then put the truck in park and turn the ignition off.

With the truck off you will then just want to feel both the transmission lines. The cooler of the two lines is your return line which is what you will use to install the cooler.

expert reply by: Chris R