Mishimoto Full-Flow Thermal Bypass Valve Kit

2012–2021 Chrysler 300 / Dodge Challenger / Dodge Charger 3.6L V6

Part #: MMTC-GMP-TBVFF

Overview

The Mishimoto Full-Flow Thermal Bypass Valve Kit is a precision-engineered direct replacement for the factory thermostatic bypass valve found on the transmission cooler lines of select Chrysler 300, Dodge Challenger, and Dodge Charger models equipped with the 3.6L V6 and 8HP45/845RE transmissions from 2012 to 2021. This upgrade is designed to enhance transmission cooling efficiency and reliability by eliminating the common failure point of the stock valve, which can lead to transmission overheating or restricted fluid flow.

Ideal for enthusiasts and daily drivers alike, this full-flow valve ensures continuous transmission fluid circulation through the cooler immediately upon startup. This promotes optimal fluid temperatures, reduces the risk of overheating, and helps extend the overall life of your transmission, especially under demanding conditions such as hot climates, towing, or spirited driving.

Key Features

Engineered to deliver superior transmission cooling performance and durability, the Mishimoto Full-Flow Thermal Bypass Valve Kit offers the following benefits:

• Direct-fit replacement for 2012–2021 Chrysler 300, Dodge Challenger, and Dodge Charger models with 8HP45 or 845RE transmissions
• Full-flow design allows uninterrupted transmission fluid circulation through the cooler, eliminating flow restrictions caused by the factory valve
• Prevents transmission overheating by removing the failure-prone thermostatic bypass valve mechanism
• Improves transmission fluid temperature management in hot climates, towing, and aggressive driving scenarios
• Constructed from CNC-machined aluminum for enhanced strength and corrosion resistance
• Simple installation requiring less than one hour with no vehicle modifications needed
• Includes Mishimoto’s industry-leading Lifetime Warranty for long-term peace of mind

Construction & Design

The valve housing is meticulously CNC-machined from high-quality aluminum, offering superior durability and corrosion resistance compared to the stock plastic valve. This robust construction ensures reliable performance even under extreme operating conditions. The full-flow design eliminates the restrictive thermostat mechanism found in the factory valve, allowing continuous transmission fluid flow to the cooler from engine startup. This design not only prevents valve failure but also maintains consistent transmission operating temperatures for improved reliability and longevity.

Installation & Fitment

The Mishimoto Full-Flow Thermal Bypass Valve Kit is a direct bolt-on replacement for the factory valve on 2012–2021 Chrysler 300, Dodge Challenger, and Dodge Charger models equipped with the 3.6L V6 and 8HP45 or 845RE transmissions. Installation is straightforward and can typically be completed in under one hour using basic hand tools. No modifications or additional components are required, making this an accessible upgrade for both professional installers and experienced enthusiasts.

What's Included

• Full-flow thermal bypass valve housing (CNC-machined aluminum)
• All necessary seals and fittings for direct replacement
• Detailed installation instructions

Ideal For

This valve kit is perfect for owners of Chrysler 300, Dodge Challenger, and Dodge Charger vehicles who want to improve transmission cooling reliability and performance. It is especially beneficial for drivers in hot climates, those who tow heavy loads, or enthusiasts who engage in aggressive driving where transmission temperatures can rise rapidly. By eliminating the stock valve’s failure-prone thermostat, this upgrade helps maintain optimal transmission fluid temperatures and extends transmission life.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.