SDS has the Mishimoto MMTC-L5P-TBV Transmission Thermal Bypass Valve that will regulate the trans temperatures in your 2017-2019 GM 6.6L Duramax L5P. The factory cooling system for the Allison 1000 transmission incorporates an in-line thermal bypass valve that modulates fluid flow to the cooler. Until the cooler reaches operating temperature, this valve prevents transmission fluid from flowing through the trans cooler. The thermostat in this valve, on the other hand, is prone to failure, and if it does, the fluid will never reach the cooler, causing the transmission to overheat. To remedy this issue, Mishimoto has developed a full-flow thermal bypass valve improvement for your truck.

The Mishimoto CNC-machined aluminum thermal bypass valve not only looks nicer, but it also operates better than the factory unit. In cold climates, this Mishimoto thermal bypass valve set features a fully serviceable thermostat for quick warm-up. A thermostat bypass is also included in this kit, which can be added to offer consistent cooling in hot areas or for usage in harsh driving/towing situations. Internal channels in the Mishimoto thermal bypass valve have been purposefully machined to enhance flow over the stock valve for more effective cooling. Cooling fins have been machined inside the valve body provide further heat dissipation. The Mishimoto Lifetime Warranty and a durable black anodized finish are included in this Thermal Bypass Valve Kit.

• Durable Anodized / Raw Finish
• Installs In Less Than 1 Hour
• Eliminates Failure-Prone Bypass Valve
• Durable CNC-Machined Billet-Aluminum Construction
• Helps Extend Transmission Life & Prevent Overheating
• Integrated Heat-Sink Fins Provide Unique Styling & Added Heat Dissipation
• Fits With Stock Transmission Cooler Piping, Requiring No Modification For Installation
• Fully Serviceable Thermostat For Fast Warm-Up In Cold Climates & Thermostat Bypass for Hot Climates
• Mishimoto Lifetime Warranty

(1) Assembly Notecard

(1) Removable Thermostat

(1) Transmission Line Mounting Plate

(1) Transmission Line Mounting Plate Bolt

(1) CNC-Machined Billet Aluminum Thermal Bypass Valve

(2) 7/8” X 14 Quick-Disconnect Transmission Line Fittings

(1) Removable Thermostat Bypass w/ Installation Hardware