Fleece Performance LBZ | LMM Duramax Allison Transmission Cooler Lines (FPE-TL-LBZ-LMM)

Eliminate the frustrating and costly problem of leaking transmission cooler lines on your 2006–2010 GM 6.6L Duramax LBZ or LMM with the Fleece Performance Allison Transmission Cooler Lines (FPE-TL-BZ-LMM).

Factory lines on these trucks are notorious for developing leaks at the fittings and along the line due to age, vibration, and heat cycling. The Fleece kit replaces them with heavy-duty, high-flow flexible lines engineered specifically for the Allison 1000 transmission. With a 5/8" inner diameter and durable construction, these lines improve fluid flow and cooling efficiency while offering much easier routing than the rigid factory tubing.

This is a complete, ready-to-install solution that includes everything needed for both stock radiators and popular aftermarket Setrab transmission coolers.

Kit Includes:

• High-flow 5/8" ID flexible transmission cooler lines
• (6) 7/8"-14 O-ring to -10AN fittings (stock radiator)
• (2) M22x1.5 to -10AN Setrab fittings
• (2) Large OD / concave washers
• Double hose clamps and locking cable ties

Key Benefits:

• Stops leaks and prevents transmission fluid loss
• Improves cooling capacity for towing, hauling, and daily driving
• Flexible design makes installation easier and allows better line routing
• All necessary fittings included for stock or aftermarket radiator setups
• Built to withstand the demands of diesel truck use
• 1-year limited warranty

Vehicle Fitment:

• 2006–2007 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD (LBZ)
• 2007.5–2010 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD (LMM)
• Allison 1000 automatic transmission

Important Notes:

• Includes fittings for both stock radiators and Setrab-equipped aftermarket coolers.
• Fitment is not guaranteed on non-stock components due to the wide variety of aftermarket radiators and modifications.
• For maximum protection in high-heat applications, consider adding transmission line heat shielding.

Protect your Allison transmission and restore reliable cooling with this premium upgrade from Fleece Performance — a trusted name in Duramax performance parts.