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01-03 GM LB7 6.6L Duramax Mishimoto Transmission Cooler


  • Direct fit for all 2001-2003 Chevrolet/GMC 6.6L Duramax (LB7)
  • 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
  • 174% greater core volume than stock cooler
  • 192% greater external fin surface area over stock cooler
  • Patent #D900,161
  • Mishimoto Lifetime Warranty


There's no greater enemy for a transmission than heat. Whether your 2001-2003 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 2001-2003 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 2001-2003 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.


  • Mishimoto Stacked Plate Transmission Cooler
  • CNC-Machined Quick-Disconnect to Hose Barb Adapters
  • Stock-style Quick-Disconnect Fittings
  • Transmission Hoses
  • Mounting Brackets
  • Worm Gear Clamps
  • Zip Tie
  • Mounting Hardware
  • Mishimoto Lifetime Warranty


This kit fits with early 2003 trucks with orange clips. Late 2003 trucks with purple clips should use MMTC-DMAX-03

Mishimoto: MMTC-DMAX-01SL

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