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Heating and Cooling› Oil and Fluid Coolers

Mishimoto

Performance Transmission Cooler

Name: Performance Transmission Cooler
Brand: Mishimoto
SKU: MMTC-JL-18SL-MM

$357.95

SKU: MMTC-JL-18SL-MM

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Mishimoto performance transmission cooler is designed for the 2018+ Jeep Wrangler JL and 2020+ Gladiator. It offers an 83-percent increase in fluid capacity and a 93-percent increase in external tube area over the stock cooler.

This cooler features a tube-and-fin core with internal fins to balance cooling and flow, providing a 195-percent increase in internal fin surface area for comprehensive cooling. It includes Mishimoto's Lifetime Warranty.

Show original supplier description

The Mishimoto performance transmission cooler is a direct-fit solution for the 2018+ Jeep Wrangler JL and 2020+ Gladiator, addressing the limitations of the stock transmission cooler. Engineered to maximize cooling efficiency, this unit boasts an 83% increase in fluid capacity and a 93% increase in external tube area compared to the OEM cooler. The internal design incorporates fins within the tubes, further increasing cooling surface area and ensuring optimal fluid contact for heat dissipation. This results in a significant 195% increase in internal fin surface area, crucial for maintaining transmission temperatures under demanding conditions, whether on the highway or tackling challenging off-road trails. This cooler is backed by the Mishimoto Lifetime Warranty, offering peace of mind and assurance against overheating issues.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Mishimoto
Part Number	MMTC-JL-18SL-MM
Category	Heating and Cooling

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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