Mishimoto Performance Transmission Cooler

2018–2022 Jeep Wrangler JL / 2020–2022 Jeep Gladiator JT

Part #: MMTC-JL-18SL

Overview

The Mishimoto Performance Transmission Cooler is a precision-engineered upgrade designed specifically for the Jeep Wrangler JL (2018–2022) and Jeep Gladiator JT (2020–2022) equipped with the factory ZF 8-speed transmission. This cooler addresses the common overheating issues caused by the stock transmission cooler’s limited surface area and airflow, which can lead to premature transmission wear and costly repairs.

Whether you are tackling challenging off-road trails, towing heavy loads, or cruising on highways in hot climates, maintaining optimal transmission fluid temperature is essential for reliable performance and drivetrain longevity. The Mishimoto cooler significantly improves cooling efficiency, helping to protect your transmission under extreme conditions and extending the life of your vehicle’s drivetrain components.

Key Features

Built with advanced cooling technology, the Mishimoto Performance Transmission Cooler offers substantial improvements over the factory unit, delivering enhanced heat dissipation and fluid capacity for superior transmission protection:

• 195% increase in internal fin surface area for improved heat transfer
• 93% larger external tube area to maximize airflow contact
• 32% increase in external fin area to boost cooling efficiency
• 83% greater fluid capacity to maintain cooler transmission fluid during low airflow conditions
• Unique internal tube fins that increase fluid contact with cooling surfaces
• Custom fitment tailored specifically for Jeep Wrangler JL and Gladiator JT models
• Durable construction designed to withstand harsh off-road environments
• Backed by Mishimoto’s Lifetime Warranty for long-term peace of mind

Construction & Design

The Mishimoto transmission cooler is crafted from high-quality aluminum, chosen for its excellent thermal conductivity and resistance to corrosion. The design features a larger core with expanded tube and fin areas, allowing significantly more air to flow through and absorb heat efficiently. Internal fins within the tubes increase the surface area in contact with transmission fluid, optimizing heat transfer and cooling performance.

This robust construction ensures reliable operation in demanding conditions, whether you are crawling slowly over rocky terrain or driving at highway speeds. The cooler’s durable build is engineered to resist damage from off-road debris and environmental exposure, making it a dependable upgrade for Jeep enthusiasts.

Installation & Fitment

Installation of the Mishimoto Performance Transmission Cooler is straightforward and requires no permanent modifications to your Jeep Wrangler JL or Gladiator JT. It is a direct-fit replacement for the factory cooler, utilizing existing mounting points and transmission lines for a seamless, plug-and-play upgrade. Basic hand tools are all that’s needed, and detailed instructions are included to ensure a secure, leak-free installation.

What's Included

• Mishimoto Performance Transmission Cooler core
• Mounting hardware and brackets
• Installation instructions

Ideal For

This transmission cooler is ideal for Jeep Wrangler and Gladiator owners who frequently tow, haul, or drive in extreme conditions such as off-road trails, desert heat, or mountainous terrain. It is also an excellent upgrade for daily drivers seeking enhanced transmission protection and longevity. Whether you are a weekend adventurer or a serious off-road enthusiast, this cooler helps maintain optimal transmission temperatures for improved reliability and peace of mind.

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.