Mishimoto 17-19 GM 6.6L Duramax (L5P) Transmission Cooler - Silver
Mishimoto 17-19 GM 6.6L Duramax (L5P) Transmission Cooler - Silver
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Mishimoto 17-19 GM 6.6L Duramax (L5P) Transmission Cooler - Silver
When it comes to maintaining the health of your transmission, there's no greater enemy than heat. Whether your 2017-2019 Chevy or GMC 6.6L L5P Duramax is a dedicated tow vehicle, a robust fleet truck, or a spirited daily driver, keeping your transmission cool is essential for optimal performance. Enter the Mishimoto Transmission Cooler, crafted to meet the demands of your power-packed vehicle.
Key Features:
- Stacked-Plate Design: This transmission cooler features a robust stacked-plate design that enhances durability and provides exceptional cooling efficiency.
- Larger Core Size: With a 67% greater core volume than the stock cooler, you can expect a significant boost in cooling capacity.
- Enhanced Surface Area: Enjoy a remarkable 164% greater fin surface area, allowing for improved heat dissipation.
- Direct-Fit Installation: CNC-machined adapters connect seamlessly to the stock transmission cooler lines, ensuring a leak-free fit.
- Tailor-Made Components: Installation is a breeze with direct-fit brackets and custom hoses designed specifically for your vehicle.
Benefits:
- Prevents overheating, prolonging the life of your transmission.
- Improves towing capacity and vehicle performance under heavy loads.
- Ensures reliable operation whether you're on the job or at the drag strip.
- Backed by a Lifetime Warranty with Accident Protection for peace of mind.
Don’t let heat compromise your transmission’s performance. Upgrade to the Mishimoto 17-19 GM 6.6L Duramax (L5P) Transmission Cooler and experience the difference in quality and efficiency. Whether you're pulling heavy loads or zipping down the drag strip, this cooler is designed to keep your transmission running smoothly and reliably for years to come.
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Shipping & Returns
Shipping & Returns
📦 Shipping:
Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days, depending on your location.
↩️ Returns:
You may return or exchange products within 60 days of receiving your order. Items must be in original condition with proof of purchase. If your item is defective or damaged due to manufacturing issues, we’ll replace it at no additional cost.

