Mishimoto 2017+ 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit for GMC

The Allison transmission in L5P 6.6L Duramax trucks generates significant heat under towing and heavy-load conditions, and this thermal bypass valve kit replaces the factory in-line thermostat with a CNC-machined aluminum unit that improves fluid routing and heat dissipation. Designed for 2017+ Chevrolet and GMC 6.6L Duramax applications, the upgrade features machined internal passages for increased flow to the transmission cooler, integrated cooling fins for extra heat rejection, and a serviceable thermostat plus optional bypass for constant cooling during extreme use or hot climates.

Features:

• CNC-machined aluminum construction
• Machined internal passages for improved flow
• Cooling fins machined into valve body
• Serviceable thermostat for fast warm-up
• Thermostat bypass for constant cooling
• Black anodized corrosion-resistant finish
• Designed for Allison 1000 L5P transmissions

Contents:

• Thermal bypass valve
• Serviceable thermostat
• Thermostat bypass