Transmission Cooler Line and Hose Kit, Toyota Tundra 5.7L

This is the complete cooler pipeline for the 5.7L V8 Tundra and Sequoia: one transmission oil cooler line assembly (OE 32907-0C020) plus the two rubber hoses that connect it, OE 32941-0C030 and 32942-0C040. It fits 2007-2021 Toyota Tundra 5.7L V8 and 2008-2011 Toyota Sequoia 5.7L V8. Check your existing part numbers before ordering, because Toyota used more than one cooler line routing across this body style.

These lines run underneath the truck where they take road salt and spray year round. The steel section rusts from the outside in and the rubber sections go hard and crack at the crimps, and either one ends the same way: a slow drip that turns into a fluid dump once the line lets go. Because the cooler circuit runs at full pump pressure, a failure here empties the transmission in a hurry, and a Tundra that loses its fluid on the highway is a burnt converter and glazed clutches, not just a mess on the driveway.

The hard line here is seamless steel and the hoses are nitrile rubber, so it is a like-for-like replacement rather than an adapter setup. Replace the hard line and both hoses together. Techs who only chase the one leaking section usually end up back under the truck a season later for the piece next to it, since everything down there aged at the same rate. Drop the fluid level first, unclip the line from its retainers, swap the assembly, then refill and check the level hot with the engine running.