Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
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Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit
Upgrade your Allison transmission's performance with the Mishimoto 2017+ GMC 6.6L Duramax L5P Transmission Thermal Bypass Valve Kit. Designed specifically for the L5P Duramax, this kit is essential for maintaining optimal transmission fluid temperatures, ensuring longevity and reliability.
Key Features:
- Enhanced Flow: Our CNC-machined aluminum design eliminates the stock thermostat, allowing for full fluid flow to the cooler at all times.
- Improved Cooling Efficiency: Strategically machined internal passages ensure better fluid flow, providing more effective cooling compared to the stock valve.
- Durable Construction: Built to last with a robust black anodized finish, resistant to wear and tear.
- Lifetime Warranty: Backed by the Mishimoto Lifetime Warranty for peace of mind.
Benefits:
- Prevents Overheating: Keeps your transmission cool, especially in warm climates or during heavy towing.
- Increased Reliability: Reduces the risk of transmission failure due to overheating.
- Better Performance: Optimizes fluid temperatures for enhanced overall vehicle performance.
Don't compromise on your transmission's health. Equip your 2017+ Chevrolet/GMC 6.6L Duramax L5P with the Mishimoto Thermal Bypass Valve Kit and experience the difference in performance and durability.
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.

