Mishimoto Transmission Cooler for 2001-2003 Chevrolet/GMC Silverado/Sierra 2500HD/3500 (6.6L)

Fits 2001-2003 Chevrolet Silverado 2500 HD/3500 and GMC Sierra 2500 HD/3500 (6.6L Duramax LB7).

Excessive heat is the primary cause of transmission failure, especially in heavy-duty applications like towing or hauling. The Mishimoto MMTC-DMAX-01SL transmission cooler is a direct-fit solution engineered to keep fluid temperatures stable on your 2001-2003 Duramax. Utilizing a high-efficiency stacked-plate design, this cooler provides superior durability and thermal management compared to the factory equipment.

This upgrade significantly increases cooling capacity, boasting a 174% greater core volume and a 192% greater fin surface area than the stock core. To ensure a reliable, leak-free installation, the kit includes CNC-machined adapters that connect directly to the factory transmission lines or aftermarket AN lines. Direct-fit brackets and application-specific hoses are provided to simplify the installation process.

• Direct-fit for 2001-2003 Chevrolet/GMC with Allison transmission
• High-efficiency stacked-plate construction for maximum heat dissipation
• 174% increase in core volume and 192% increase in fin surface area
• CNC-machined adapters for leak-free connections to stock or AN lines
• Includes direct-fit brackets and tailor-made hoses for easy installation
• Backed by the Mishimoto Lifetime Warranty
• Manufacturer Part Number: MMTC-DMAX-01SL