Mishimoto MMTC-DMAX-03SL Transmission Cooler, Compatible with Chevrolet & GMC Duramax 6.6 LB7 & LLY, 2003-2005, Silver

★★★★★ 4.5 100 reviews

$426.95
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$426.95
Price when purchased online
Free shipping Free 30-day returns

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Management number 212696212 Release Date 2026/04/06 List Price $170.78 Model Number 212696212
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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 it's 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.

  • Direct-fit for all 2003-2005 Chevrolet/GMC 6.6L Duramax (LB7/LLY)
  • 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
  • Mishimoto Lifetime Warranty
UPC 811580034084
Color Silver
Brand Name Mishimoto
Item Weight 9.3 Pounds
Manufacturer Mishimoto
Model Number MMTC-DMAX-03SL
Item Type Name Transmission Cooler for Chevrolet/GMC 6.6L Duramax (LB7/LLY) 2003-2005
Exterior Finish Smooth
Item Dimensions 29 x 4 x 14 inches
Included Components transmission cooler
Manufacturer Warranty Description Lifetime Warranty
Global Trade Identification Number 00811580034084

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