Uploaded August 2026 | Updated September 2026, 15 hours ago

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Learn how to install a new transmission cooler for the 2020+ Chevrolet/GMC Duramax 6.6L!

Need a new transmission cooler for your 2020+? Chevrolet/GMC Duramax 6.6L? Click the link below!
mishimoto.com/transmission-cooler-chevrolet-gmc-6-6l-duramax-l5p-2020.html

In this detailed tutorial, we will walk you through each essential step of the transmission cooler installation process and give insightful tips and tricks. Whether you're a seasoned car enthusiast or a DIY beginner, this video is your go-to resource for efficiently installing the Mishimoto Transmission Cooler for the 2020+ Chevrolet/GMC Duramax 6.6L.

SIDE NOTE: This video solely focuses on the steps for installing the Mishimoto transmission cooler. For more information on disassembling and reassembling the vehicle, you may refer to the OEM service manual or our written installation guide on our website.

Steps:
0:00 Intro
0:08 Supplied parts & tools needed
0:29 Removing the stock transmission cooler
1:22 Prepping the Mishimoto transmission cooler
1:45 Installing the Mishimoto transmission cooler
2:53 Outro



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