Chevrolet/GMC 6.6L Duramax (LML) Transmission Cooler, 2011-2014

Direct fit for all 2011–2014 Chevrolet/GMC 6.6L Duramax (LML)
Stacked-plate construction for maximum durability and superior cooling
CNC-machined adapters make it easy to connect Mishimoto cooler to stock fluid lines or AN lines
41% greater core volume than stock cooler
73% greater external fin surface area over stock cooler
Patent Pending
Mishimoto Lifetime Warranty


There’s no greater enemy for a transmission than heat. Whether your 2011–2014 Chevy/GMC 6.6L Duramax is a dedicated tow vehicle, hardworking fleet truck, or a daily driver with a liking for the drag strip, you need to ensure that your transmission runs cool.

Luckily, Mishimoto has developed a direct-fit transmission cooler to do just that. Our 2011–2014 Chevy/GMC 6.6L Duramax transmission cooler utilizes a stacked-plate design for maximum durability and powerful cooling. Aside from its durable construction, this transmission cooler is significantly larger than the stock core. The Mishimoto transmission cooler boasts a 41% greater core volume, and 73% greater fin surface area than the stock 2010–2014 Duramax transmission cooler.

The included CNC-machined adapters connect directly to the stock transmission cooler lines for leak-free cooling. Direct-fit brackets and tailor-made hoses make installation easy. Like all Mishimoto products, this transmission cooler is backed up by our Lifetime Warranty with Accident Protection for worry-free cooling as long as you own it.