Mishimoto | Transmission Cooler Kit | 24+ Land Cruiser

Overview

The Land Cruiser 250 and GX 550 are already proving what many owners suspected early on: factory transmission cooling margins are tight once real-world variables are introduced.

Long grades, sustained off-road use, hot climates, and especially larger-than-stock tires are already triggering transmission temperature warnings — even without towing. These trucks are capable, but added load and reduced airflow quickly push transmission fluid temperatures past ideal operating ranges.

A dedicated transmission cooler isn’t about chasing performance — it’s about thermal headroom and drivetrain protection.

Our transmission cooling upgrades are designed to reduce peak fluid temperatures, stabilize heat during sustained climbs and trail work, and protect one of the most expensive systems on your truck. Lower temperatures mean improved fluid life, reduced heat-related wear, and consistent operation when conditions get demanding.

We lead with the Mishimoto transmission cooler, engineered specifically for modern Toyota platforms. It features a high-efficiency stacked-plate core, optimized flow characteristics, and vehicle-specific mounting for a clean install. This is a preventative upgrade meant to address the exact scenarios LC250 and GX 550 owners are already encountering — not a theoretical problem.

If you’re running larger tires, spending time in the mountains, exploring slow technical terrain, or driving in hot conditions, upgraded transmission cooling is one of the smartest reliability mods you can make early on.

Why Transmission Cooling Matters on the LC250 / GX 550

• Larger tires increase drivetrain load and heat buildup

• Long highway grades reduce airflow and elevate sustained temps

• Off-road driving limits cooling while stressing the transmission

• Repeated heat spikes accelerate fluid breakdown and wear

• Early temperature warnings indicate limited factory headroom

A transmission cooler adds margin where the platform needs it most.