Mishimoto 2006-2010 Chevrolet/GMC 6.6L Duramax (LLY/LBZ/LMM) Transmission Cooler Line Kit

This Mishimoto performance cooler is a direct-fit upgrade for 2006-2010 Chevrolet/GMC applications covering Sierra 2500 HD, Sierra 3500, Sierra 3500 Classic, Sierra 3500 HD, Sierra 3500 SL. It replaces the weak points of the stock part with stronger materials and better flow or cooling so heat, boost and abuse stay under control on street and track duty. AutoTalent lists verified US-market fitment in the table below.

Why upgrade

Every truck owner knows that it doesn't matter how powerful or reliable your engine is if you can't get any power to the wheels. The transmission mated to your 2006-20010 LLY/LBZ/LMM Duramax is essential to everything your truck does, and keeping it cool is crucial. Mishimoto engineers these kits around real chassis packaging, so hoses, coolers and adapters line up without fabrication on the listed years. Follow the published torque specs and install guide, reuse sensors where instructed, and confirm clearances if you run other supporting mods. Every unit ships with the Mishimoto Lifetime Warranty for as long as you own it.

Features

• Direct fit for 2006-2010 LLY/LBZ/LMM Duramax
• PTFE inner liner is extremely oil and heat resistant for maximum durability
• High-strength nylon outer braid prevents expansion under high pressure and protects line against abrasion
• Working pressure of 2,000 psi and burst pressure of 6,000 psi
• High-flow -10AN lines and fittings ensure high flow while preventing leaks
• Includes -10AN to M22x1.5 fittings for use with many aftermarket radiators
• Fits with Mishimoto Performance Transmission Coolers

What's Included

• -10AN 46.45-in Line w/ 90-degree & 45-degree Fittings
• -10AN 69.68-in Line w/ 90-degree Fittings
• -10AN 39.76-in Line w/ 90-degree Fittings
• -10AN to 7/8-in-14 ORB Fittings
• -10AN to M22x1.5 Fittings
• Washers
• Zip Ties
• Mishimoto Lifetime Warranty

Specifications

Fitment Notes

Verified against Mishimoto US applications and dealer listing for 2006-2010 (10 rows). Years extended to 2027 where the US model remains in production.

Vehicle Fitment