Mishimoto Thermal Bypass Valve Kit

2013–2018 Ram 2500 / 3500 6.7L Diesel

Part #: MMTC-RAM-TBVFF

Overview

The Mishimoto Thermal Bypass Valve Kit is a vital upgrade designed specifically for the transmission cooling system of 2013–2018 Dodge Ram 2500 and Ram 3500 trucks equipped with the 6.7L Cummins diesel engine. This kit replaces the factory thermal bypass valve, which contains a thermostat prone to failure and restricted fluid flow. By providing full, unrestricted transmission fluid flow to the cooler at all times, the Mishimoto valve eliminates overheating risks and improves overall transmission cooling efficiency.

Ideal for Ram owners who tow heavy loads, drive in hot climates, or demand enhanced transmission reliability, this valve kit ensures your transmission stays cooler under high stress conditions. It offers peace of mind by protecting your truck’s transmission from heat-related damage during demanding use.

Key Features

Engineered for durability and superior performance, the Mishimoto Thermal Bypass Valve Kit offers several advantages over the stock valve:

• Full-flow design that removes the failure-prone internal thermostat found in factory valves
• CNC-machined billet aluminum construction for exceptional strength and lightweight durability
• Precision-machined internal passages to optimize transmission fluid flow and cooling efficiency
• Integrated cooling fins on the valve body to increase heat dissipation and maintain lower fluid temperatures
• Durable silver anodized finish for corrosion resistance and long-lasting appearance
• Compatible with both 68-RFE and Aisin AS69RC transmissions used in Ram 2500 and 3500 models
• Designed to handle up to 930 lb-ft of torque produced by the 6.7L Cummins engine
• Backed by the Mishimoto Lifetime Warranty for confidence and reliability
• Simple installation process requiring less than one hour with basic hand tools

Construction & Design

The valve is precision CNC-machined from billet aluminum, delivering a robust yet lightweight component built to withstand the rigors of heavy-duty use. Its internal fluid passages are strategically engineered to maximize flow and prevent bottlenecks that can cause overheating. Cooling fins are machined directly into the valve body, increasing surface area to enhance heat dissipation and maintain optimal transmission fluid temperatures. The silver anodized finish protects against corrosion and wear, ensuring long-term durability and a clean, professional appearance.

Installation & Fitment

Installation of the Mishimoto Thermal Bypass Valve Kit is straightforward and can be completed in under one hour using basic hand tools. It directly replaces the factory thermal bypass valve without requiring any modifications to the transmission cooling system. This kit fits 2013 through 2018 Ram 2500 and Ram 3500 trucks equipped with the 6.7L Cummins diesel engine, including popular trims such as Big Horn, Laramie, Laramie Limited, Laramie Longhorn, Limited, Lone Star, Outdoorsman, Power Wagon, SLT, ST, and Tradesman.

What's Included

• Mishimoto full-flow thermal bypass valve
• All necessary mounting hardware
• Detailed installation instructions

Ideal For

This thermal bypass valve kit is perfect for Ram 2500 and 3500 owners who require enhanced transmission cooling performance and reliability. It is especially beneficial for:

• Drivers operating in warm or hot climates where transmission overheating is a concern
• Owners who frequently tow heavy trailers or haul substantial loads
• Enthusiasts seeking to improve transmission longevity and reduce maintenance issues
• Anyone looking to upgrade from the stock valve to a more durable, maintenance-free solution

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.