2017-2019 Duramax Transmission Cooler Thermostat Bypass Kit (L5P-FLU-A178)

Fits

Year	Make	Model
2017-2019	Chevrolet/GMC	Duramax L5P w/ 6.6L

We engineered this L5P bypass kit to eliminate the most common failure point in the factory transmission cooling system. Our solution removes the faulty thermostat altogether and enables continuous flow through the auxiliary transmission cooler. This eliminates the risk of a thermostat failure while providing better cooling and transmission performance for L5P trucks consistently under load. By ensuring continuous fluid flow through the secondary heat exchanger, our kit prevents the catastrophic overheating and part degradation that occurs when the OEM unit fails to open.

Part Number: L5P-FLU-A178

Why Shop Dirty?

• Canadian-Made Performance: High-performing parts made in-house in our shop in West Kelowna and sourced from across North America with the highest quality standards

• Born in the Shop: Our parts are engineered with real-world experience. Whether it's an OEM fix or a performance upgrade, we build what we know works. We make our parts to solve real-world problems.

• Dirty Made Quality: Our kits are trusted by shops across Canada because we design with the end user in mind. We aren’t just designing the kits; we are installing them every day in our own shop. We use our own products every day. From the first weld to the last bolt, we build tough gear that actually fits, handles abuse, and looks the part.

• Precision 6061-T6 Aluminum Construction
• Continuous Auxiliary Fluid Flow
• 1/8 NPT Plug
• Corrosion-Resistant Stainless Steel Clamp
• Canadian Designed and Manufactured
• High-Pressure OEM Line Fittings

• (1) Thermostat Bypass Housing
• (1) Thermostat Bypass Pipe Clamp
• (2) Oil Cooler Line Quick Connect Fittings
  
• (1) M6 x 20MM Flange Head Bolt

Material	6061-T6 Aluminium
Hardware	Stainless Steel
Origin	Canada

• The 1/8 NPT plug is the same thread as most transmission fluid pressure sensors. In a service situation, the port can be used to insert sensors for diagnostic purposes.

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