Mishimoto Transmission Thermal Bypass Valve Kit

Fits 2017+ GMC Duramax L5P

Part #: MMTC-L5P-TBVFF

Overview

The Mishimoto 2017+ GMC Duramax L5P Transmission Thermal Bypass Valve Kit is a specialized upgrade designed to enhance the cooling efficiency of your Allison transmission. Built specifically for the robust L5P Duramax diesel engine, this kit helps maintain optimal transmission fluid temperatures, ensuring reliable performance and longevity under demanding driving conditions. Whether you're towing heavy loads or pushing your truck to its limits, this bypass valve kit supports your transmission’s thermal management system, helping prevent overheating and potential damage. This product is ideal for truck enthusiasts, fleet operators, and anyone looking to improve the durability and performance of their vehicle’s transmission. By optimizing fluid flow and heat dissipation, it contributes to smoother shifting, reduced wear, and extended transmission life, especially during high-stress operations. Primary benefits include improved thermal regulation, enhanced transmission reliability, and peace of mind during heavy-duty use. The kit is engineered to work seamlessly with your existing cooling system, providing a straightforward upgrade that supports your vehicle’s performance and durability.

Key Features

This Mishimoto transmission bypass valve kit features a durable, high-quality construction designed to withstand the harsh conditions of diesel truck operation. Its precise engineering ensures consistent fluid flow control, helping to prevent heat buildup in your transmission. The kit is easy to install, with a design that integrates smoothly into your vehicle’s existing cooling system. Made from corrosion-resistant materials, it offers long-lasting performance and reliability. The thermal bypass valve helps maintain stable transmission temperatures, supporting optimal shifting and reducing the risk of overheating during towing or aggressive driving.

Construction & Design

Constructed from high-grade, corrosion-resistant materials, this bypass valve kit is engineered for durability and reliable performance. Its compact design allows for straightforward installation without modifications, ensuring a secure fit within your vehicle’s transmission cooling system.

Driving Feel & Feedback

By maintaining consistent transmission temperatures, this kit helps ensure smooth shifting and consistent driving feel, especially under heavy load or high-temperature conditions. It supports your vehicle’s ability to respond predictably, enhancing overall driving confidence.

Installation & Fitment

The Mishimoto Thermal Bypass Valve Kit is designed for a direct bolt-on installation, compatible with 2017 and newer GMC Duramax L5P models. It integrates seamlessly into the existing transmission cooling system, requiring minimal tools and effort for a straightforward upgrade.

What’s Included

The package includes the thermal bypass valve, necessary fittings, and installation hardware, providing everything needed for a complete and secure setup.

Ideal For

This product is perfect for diesel truck owners who frequently tow, haul heavy loads, or operate in high-temperature environments. It’s an excellent upgrade for those seeking to improve transmission reliability and extend the lifespan of their vehicle’s drivetrain.