Wehrli Transmission Cooler Thermostat Bypass Plug for 2014-2019 Silverado/Sierra & L5P Duramax - WCF100469

Key Features & Specs:

• Brand: Wehrli
• Part Number: WCF100469
• Product Type: Transmission cooler thermostat bypass plug
• Material: CNC machined billet aluminum
• Finish: Black anodized
• Seals: High-temperature silicone O-rings
• Function: Eliminates restrictive factory thermostat bypass
• Performance Gain: Reduces transmission temps by 15–50°F
• Installation: Direct replacement, simple install
• Compatibility: Stock and built transmissions
• Use Case: Ideal for towing and warm climates
• Reversibility: Can be swapped back to OEM setup

Fitment:

• 2014-2018 Chevrolet Silverado 1500
• 2014-2018 GMC Sierra 1500
• 2017-2019 Chevrolet Silverado 2500HD 6.6L Duramax (L5P)
• 2017-2019 Chevrolet Silverado 3500HD 6.6L Duramax (L5P)
• 2017-2019 GMC Sierra 2500HD 6.6L Duramax (L5P)
• 2017-2019 GMC Sierra 3500HD 6.6L Duramax (L5P)

Improve transmission cooling performance with the Wehrli WCF100469 Transmission Cooler Thermostat Bypass Plug. Designed as a direct replacement for the failure-prone factory thermostatic bypass, this CNC-machined billet aluminum plug eliminates unnecessary flow restriction and helps reduce transmission fluid temperatures by 15–50°F. Finished in a durable black anodized coating and equipped with high-temperature silicone O-ring seals, it ensures long-lasting reliability under demanding conditions. Ideal for both stock and built transmissions, especially in towing or warm climates, this upgrade provides consistent fluid flow through the cooler while still allowing easy reinstallation of the OEM thermostat for cold weather use.