GM Transmission Cooler | Mishimoto Transmission Cooler | MMTC-DMAX-03SL


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GM Transmission Cooler . There’s no greater enemy for a transmission than heat. Whether your 2003–2005 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 2003–2005 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 174% greater core volume, and 192% greater fin surface area than the stock 2003–2005 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.



  • 2003-2005 GM 6.6L Duramax (With Purple Clips)



  • Bolt-On Installation
  • Stacked-Plate Design
  • Install Hardware Included
  • Increased Cooling Efficiency
  • Lifetime Warranty



Core Height – 5.78″

Core Thickness – 1.25″

Core Length – 27.95″

Rows – 13

Material – 6061 Aluminum



Fits late 2003 trucks with purple clips.  This kit will not fit early 2003 trucks that have orange clips.  Please verify before ordering.

Additional information

Weight 11.00 lbs
Dimensions 29 × 4 × 14 in


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