Mishimoto Transmission Cooler

2015–2018 Ram 2500 / 3500 6.7L Diesel

Part #: MMTC-RAM-15SL

Overview

The Mishimoto Transmission Cooler is a direct-fit upgrade designed specifically for the 2015–2018 Ram 2500 and 3500 models equipped with the 6.7L Cummins diesel engine. Engineered to protect your transmission from excessive heat, this cooler is essential for maintaining optimal transmission temperatures during heavy towing, hauling, or demanding driving conditions. By significantly improving fluid capacity and heat dissipation, it helps extend transmission life and enhances overall reliability.

Whether you use your Ram as a work truck, a fleet vehicle, or for performance driving, the Mishimoto cooler ensures your transmission fluid stays cooler under all operating conditions. This reduces wear and prevents overheating, making it an ideal upgrade for drivers who require enhanced transmission durability and thermal management.

Key Features

Designed with advanced cooling technology, the Mishimoto Transmission Cooler offers superior performance and durability compared to the factory unit. Key features include:

• 112% greater core volume than the stock cooler for increased fluid capacity
• 237% increase in fin surface area to maximize heat dissipation
• 226% increase in fluid capacity for improved thermal management
• Tube-and-fin core design with internal fins to balance fluid flow and cooling efficiency
• Internal tube fins increase cooling surface area, ensuring more fluid contacts the tube walls
• Direct-fit replacement requiring no cutting, drilling, or modifications
• Includes all necessary mounting hardware and fittings for a straightforward installation
• Backed by Mishimoto’s Lifetime Warranty with Accident Protection for peace of mind

Construction & Design

The Mishimoto Transmission Cooler features a robust tube-and-fin core constructed from high-quality aluminum, known for its excellent thermal conductivity and corrosion resistance. The internal fins inside the tubes are engineered to maximize fluid contact with cooling surfaces, enhancing heat transfer efficiency while maintaining optimal fluid flow to prevent pressure drops or restrictions.

Every component is precision-engineered to meet or exceed OEM standards, ensuring durability and reliable operation even in demanding towing or off-road environments. The cooler’s corrosion-resistant finish protects against environmental damage, extending the life of the unit under harsh conditions.

Installation & Fitment

Installation is designed to be quick and hassle-free with a direct-fit design that bolts directly into place without any cutting, drilling, or modifications. All necessary mounting hardware, fittings, and hoses are included to facilitate a smooth upgrade process with minimal downtime.

This transmission cooler is specifically engineered to fit 2015–2018 Ram 2500 and 3500 models with the 6.7L Cummins diesel engine, ensuring perfect compatibility and optimal performance without any guesswork.

What's Included

• Mishimoto transmission cooler core
• Mounting brackets and hardware
• Installation fittings and hoses (as required)
• Detailed installation instructions

Ideal For

This transmission cooler is ideal for Ram 6.7L Cummins owners who:

• Regularly tow heavy trailers or haul large loads
• Use their truck for commercial or fleet applications requiring extended transmission durability
• Engage in performance driving or off-road activities that generate additional heat
• Want a reliable, long-lasting upgrade to their factory transmission cooling system

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.