Mishimoto MMTC-DMAX-03SL Transmission Cooler for 2003-2005 Chevrolet/GMC Silverado/Sierra 2500HD/3500 (6.6L)

Fits 2003-2005 Chevrolet Silverado and GMC Sierra 2500 HD/3500 (6.6L Duramax LB7/LLY).

Excessive heat is the primary cause of transmission failure, especially in heavy-duty applications like towing or hauling. The Mishimoto MMTC-DMAX-03SL transmission cooler provides a significant upgrade over the factory unit, utilizing a rugged stacked-plate design for maximum durability and thermal efficiency. This direct-fit cooler is engineered to keep your Allison transmission within safe operating temperatures whether on the job site or the drag strip.

The Mishimoto core is substantially larger than the stock unit, boasting a 174% increase in core volume and 192% more fin surface area. This increased capacity allows for superior heat dissipation without sacrificing airflow to the rest of the cooling stack. Installation is straightforward with included CNC-machined adapters that connect directly to the OEM transmission fluid lines or aftermarket AN lines. Tailor-made hoses and direct-fit brackets ensure a secure, leak-free mount using factory locations.

• Direct-fit for 2003-2005 6.6L Duramax (LB7/LLY) equipped with the Allison transmission
• Heavy-duty stacked-plate construction for superior durability
• 174% increase in core volume over the stock cooler
• 192% increase in fin surface area for enhanced cooling
• Includes CNC-machined adapters for leak-free connection to factory lines
• Mishimoto Lifetime Warranty