Product Description
Upgrade the transmission cooling system on your 2017-2019 Duramax with the WEHRLI CUSTOM FAB WCF100469 BILLET ANODIZED TRANSMISSION COOLER THERMOSTAT BYPASS PLUG. This precision CNC-machined billet aluminum plug eliminates the restrictive factory thermostat found in the L5P transmission cooler system, allowing transmission fluid to circulate freely through the cooler at all times.
Designed by Wehrli Custom Fabrication, this upgrade helps reduce transmission operating temperatures under heavy towing, performance driving, and demanding workloads. The durable billet aluminum construction with corrosion-resistant anodized finish ensures long-term reliability while maintaining a clean OEM-style installation.
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Key Features
- CNC-machined billet aluminum construction
- Durable corrosion-resistant anodized finish
- Eliminates restrictive factory transmission thermostat
- Allows constant transmission cooler fluid circulation
- Helps reduce transmission temperatures under load
- Simple bolt-in installation
- Precision engineered by Wehrli Custom Fabrication
Fitment
- 2017 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2018 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2019 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2017 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
- 2018 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
- 2019 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
Installation Note: This plug replaces the factory transmission cooler thermostat and allows transmission fluid to flow continuously through the cooler, which is ideal for trucks used in towing, racing, or heavy-duty work applications.
Frequently Asked Questions
What does the transmission thermostat bypass plug do?
The bypass plug removes the factory thermostat restriction, allowing transmission fluid to circulate through the cooler at all times, which helps lower transmission temperatures.
Will this lower transmission temperatures?
Yes. Continuous fluid circulation through the transmission cooler helps improve cooling efficiency, especially during towing or high load situations.
Is installation difficult?
No. This plug is designed as a direct replacement for the factory thermostat assembly and installs quickly using standard tools.
Is this recommended for towing applications?
Yes. Trucks used for towing or heavy hauling benefit from improved transmission cooling, which this bypass plug helps achieve.
Does this require tuning?
No tuning is required. This is a mechanical cooling system upgrade.
Specifications for WEHRLI CUSTOM FAB WCF100469
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100469 |
| Material | CNC Machined Billet Aluminum |
| Finish | Anodized |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | 1 lb |
| Package Dimensions | 6 x 4 x 2 inches |
| Shipping Method | UPS / FedEx Ground |
| Prop 65 Warning | This product may contain chemicals known to the State of California to cause cancer or reproductive harm. For more information visit https://www.P65Warnings.ca.gov |
