Mishimoto Thermal Bypass Full Flow Valve

2019–2026 Ram 2500 / 3500 6.7L Diesel

Part #: MMTC-RAM2-TBVFF

Overview

The Mishimoto Thermal Bypass Full Flow Valve is a precision-engineered upgrade designed specifically for 2019 to 2026 Ram 2500 and Ram 3500 trucks equipped with the 6.7L Cummins diesel engine. This valve replaces the factory in-line thermal bypass valve found in the Aisin AS69RC transmission cooling system, eliminating the restrictive internal thermostat to allow continuous transmission fluid flow.

By providing uninterrupted fluid circulation, the Mishimoto valve significantly improves transmission cooling efficiency, reducing the risk of overheating during heavy towing, extended operation, or driving in hot climates. This upgrade enhances transmission reliability and longevity, making it an essential component for Ram owners who demand optimal performance and durability under demanding conditions.

Key Features

Engineered for superior cooling and durability, the Mishimoto Thermal Bypass Full Flow Valve offers advanced features that outperform the stock valve:

• Full fluid flow design removes the factory thermostat for continuous transmission fluid circulation
• CNC-machined billet aluminum construction ensures strength and long-lasting durability
• Optimized internal fluid passages increase flow rate and cooling efficiency
• Integrated cooling fins on the valve body enhance heat dissipation
• Bypass functionality maintains consistent cooling in heavy-duty and high-temperature conditions
• Fully serviceable thermostat option available for rapid warm-up in cold climates
• Direct bolt-on replacement for 2019–2026 Ram 2500 and 3500 6.7L Cummins models
• Backed by Mishimoto’s industry-leading Lifetime Warranty for peace of mind

Construction & Design

The valve is precision-crafted from high-quality billet aluminum using CNC machining techniques to deliver exceptional strength and reliability. Its robust design withstands the rigors of heavy towing and prolonged operation, ensuring consistent performance under extreme conditions.

Internal fluid passages are strategically machined to maximize transmission fluid flow, reducing operating temperatures more effectively than the stock valve. Additionally, the valve body features integrated cooling fins that increase surface area for improved heat dissipation, helping maintain stable transmission fluid temperatures and protecting critical transmission components from heat-related wear.

Installation & Fitment

This thermal bypass valve is a direct-fit replacement for the factory unit on Ram 2500 and Ram 3500 trucks equipped with the 6.7L Cummins diesel engine from model years 2019 through 2026. Installation requires no modifications and can be completed using basic hand tools, making it a straightforward upgrade for DIY enthusiasts and professional installers alike.

The valve integrates seamlessly into the existing transmission cooling system without the need for additional adapters or components, ensuring a hassle-free installation process that restores and improves transmission cooling performance immediately.

What's Included

• Mishimoto CNC-machined billet aluminum thermal bypass valve
• Installation hardware and fittings
• Detailed installation instructions

Ideal For

This full-flow thermal bypass valve is ideal for Ram 2500 and 3500 owners who:

• Regularly tow heavy trailers or haul substantial payloads
• Operate their trucks in hot or demanding environments
• Seek to improve transmission cooling efficiency and reliability
• Want to prevent transmission overheating and extend transmission life
• Prefer a durable, maintenance-friendly upgrade backed by a lifetime warranty

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.