Mishimoto Full-Flow Thermal Bypass Valve Kit

2012–2021 Chrysler 300 / Dodge Challenger / Dodge Charger / Dodge Challenger SRT Hellcat

MMTC-GMP-TBVFF

Overview:

The Mishimoto Full-Flow Thermal Bypass Valve Kit is a direct replacement for the stock thermostatic bypass valve found on the transmission cooler lines of select Chrysler 300, Dodge Challenger, and Dodge Charger models from 2012 to 2021. Designed to improve transmission cooling efficiency and reliability, this kit eliminates the common failure point of the factory valve, which can cause transmission overheating or unnecessary flow restriction.

Ideal for enthusiasts who demand consistent transmission performance, especially in hot climates, towing scenarios, or under extreme driving conditions, this full-flow valve allows transmission fluid to circulate through the cooler immediately upon startup. This ensures optimal fluid temperatures and helps extend the life of your transmission.

Key Features:

Engineered to enhance transmission cooling 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 equipped with 8HP45 or 845RE transmissions
• Full-flow design allows continuous fluid circulation through the transmission cooler, eliminating stock valve flow restrictions
• Prevents transmission overheating caused by failure of the factory thermostatic bypass valve
• Improves transmission fluid temperature management in hot climates and during heavy-duty use such as towing or spirited driving
• Constructed from CNC-machined aluminum for durability and corrosion resistance
• Simple installation process requiring less than one hour with no modifications needed
• Includes Mishimoto’s industry-leading Lifetime Warranty for peace of mind

Construction & Design:

The valve housing is precision CNC-machined from high-quality aluminum, providing superior strength and resistance to corrosion compared to the stock plastic unit. This robust construction ensures long-lasting performance under demanding conditions. The full-flow design removes the restrictive thermostat mechanism found in the factory valve, allowing uninterrupted transmission fluid flow to the cooler from engine start-up. This design choice eliminates the risk of valve failure and promotes consistent transmission operating temperatures.

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 8HP45 or 845RE transmissions. Installation is straightforward and can typically be completed in under one hour using basic hand tools. No vehicle modifications or additional components are required, making it 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
• 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 those living in hot climates, towing heavy loads, or engaging 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.