2017-2019 Duramax Transmission Cooler Thermostat Bypass (WCF100469)
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Description
Description
Fits
| Year | Make | Engine |
| 2017-2019 | Duramax | 6.6L |
| 2014-2018 | GMC/Chevrolet 1500 | 4.3L/ 5.3L/ 6.2L |
| 2015-2020 | Suburban/ Tahoe/ Yukon | 5.3L/ 6.2/l |
| 2015 | Escalade | 6.2L |
Your Duramax is a powerhouse that you may want to modify, or throw a big trailer behind and make it work for you. Both of these are great, but you don't want that allision to overheat as that engine works. The stock cooler setup that these trucks come with sometimes fails and causes higher temperatures that you don't want to see, this part is designed to prevent that.
The stock thermostatic bypass for warming up the Allison quickly in cold weather conditions is a good idea in principle, but in practice, we've seen the valve fail to force trans fluid around the cooler in warm weather conditions that cause dangerous fluid temperatures for built and stock transmissions alike. We've been running this design on our shop development trucks and with our built transmissions successfully and are now making them available for purchase separately due to popular demand.
Part Number: WCF100469
Features
Features
- Up to 50° transmission temperature drops seen in stock trucks
- Greater flow through the cooler than the OEM transmission thermostat
- Recommended for high-temperature environments or high load situations
- CNC Machined Billet Aluminum Thermostatic Bypass Plug
- Black Anodized Finish
- High-temperature silicone O-ring seals
- Reduces fluid flow restriction to trans cooler
- Simple Installation
- Experience fluid temperature drops from 15-50 degrees F
- Direct replacement of the failure-prone OEM thermostat
- Easy swap back to OEM set up for cold weather use
Notes
Notes
- This is a special order item, please contact us for updated lead times.
- Recommended for trucks with stock or built transmissions and performing heavy towing in warm climates to help keep fluid temperatures in check.
Videos
Videos
Questions and Answers
Questions and Answers
Previously asked questions
We've compiled a list of questions and answers below.
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Interested in this, my trucks deleted and tuned, tick tune as well, runs cool as it always has, but might throw this in anyways, will this be fine even in northern Canadian climate?
The Wehrli bypass plug is safe for northern Canadian winters, but it will significantly slow your transmission warm-up times on freezing mornings, leading the manufacturer to recommend swapping it back to the stock thermostat assembly during extreme winter months to preserve optimal shifting.
