The GMC Sierra 3500HD Transmission Cooler Thermostat Bypass Plug by Wehrli is a must-have upgrade for those seeking to maintain optimal transmission performance in challenging conditions. This billet anodized plug comes in a sleek black finish, specifically designed for the `17-`19 models.

This bypass plug serves as a superior alternative to the often-flawed OEM thermostat. By significantly reducing fluid flow restriction to the transmission cooler, it effectively lowers fluid temperatures by 15-50 degrees Fahrenheit. This is crucial for both stock and performance-tuned transmissions operating in warm climates, especially during heavy towing. The robust build of the Wehrli plug, crafted from CNC machined billet aluminum, ensures long-lasting performance and reliability, making it an essential component for anyone looking to protect their transmission from high temperature-related issues.

Features

• Direct replacement for OEM thermostat
• Lower transmission fluid temperatures by 15-50°F
• CNC machined billet aluminum construction
• High-temperature silicone O-ring seals
• Easy installation and option for quick revert to OEM setup
• Black anodized finish for enhanced durability

This bypass plug not only protects your vehicle's transmission but also ensures it operates at peak efficiency, allowing you to drive with confidence. If you have questions or require assistance, don't hesitate to reach out to us directly. We are happy to provide further details and support. Our knowledgeable staff is available at 512-982-9393 for our Austin, Texas location and 562-981-6800 for our Los Angeles, California area shop, where we also offer installation and customization services. If you’re considering purchasing multiple items, please contact us for potential shipping discounts. Installation is available on-site at both locations.

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