2001-2005 6.6L LLY/LB7 Duramax Upgraded Transmission Cooler Lines

eavy-Duty Transmission Cooler Lines for 2001–2005 GM 6.6L Duramax LB7/LLY

Upgrade your factory cooler lines with this high-performance transmission cooler line kit designed for GM 6.6L LB7 and LLY Duramax engines. Built to handle high pressure and extreme conditions, these lines feature a heavy-duty 1/2" inner diameter and are constructed from durable hydraulic pipe rated to 3045 PSI. Perfect for replacing cracked, leaking, or rusted factory lines.

• Fitment: Compatible with 2001–2005 Chevrolet/GMC 6.6L Duramax Diesel LB7 and LLY models

• OEM Interchange: Replaces part number 21101404

• Durability: Constructed from rust-resistant, high-pressure hydraulic pipe for long-term reliability

• Direct Replacement: Designed to match factory fitment for easy installation without modifications