Mishimoto Chevrolet /GMC 2001-2005 6.6L Duramax LB7/LLY Transmission Cooler Line Kit

The Mishimoto transmission cooler line kit for the 2001-2005 Chevrolet/GMC 6.6L Duramax LB7/LLY routes transmission fluid to the cooler with high-performance PTFE lines wrapped in a high-strength nylon braid. The PTFE inner liner is highly oil- and heat-resistant, while the braid prevents expansion under pressure and resists abrasion. Capped with -10AN fittings for a secure, leak-free connection, the lines carry a 2,000 psi working pressure and 6,000 psi burst rating — ideal alongside a performance transmission cooler.

Specifications

Documents: Installation Instructions (PDF)

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy