Fleece Performance Coolant Bypass Kit for 2006-2007 Dodge Ram 2500/3500 (5.9L / 6.7L) Auto Trans FPE-CLNTBYPS-CUMMINS-0607

Fits select 2006-2007 Dodge Ram 2500 and 3500 trucks (5.9L / 6.7L Cummins) equipped with automatic transmissions.

The rear cylinders on the Cummins 5.9L and 6.7L engines often suffer from restricted coolant flow, leading to localized hotspots and elevated temperatures at the back of the engine block. This heat buildup creates excessive cooling system pressure that can eject external freeze plugs or the smaller diameter plugs located under the valve cover. The Fleece Performance Coolant Bypass Kit solves this by adding a secondary thermostat that operates based on coolant temperature rather than pressure, ensuring consistent flow across all six cylinders and preventing catastrophic failure.

For 2006-2007 5.9L automatic transmission applications, this kit is designed to eliminate the factory transmission fluid heat exchanger. Originally intended for warming transmission fluid in extreme cold, this exchanger is not necessary in warmer climates or high-horsepower builds and its removal does not negatively affect vehicle performance.

• Reduces coolant temperatures at the rear cylinders for improved engine longevity
• Ensures consistent operating temperatures across the entire engine block
• Prevents damaging pressure spikes that lead to freeze plug failure
• High-quality braided hose and AN O-ring fittings ensure a leak-free installation
• Billet hose brackets included for a secure, professional fit
• Manufacturer Part Number: FPE-CLNTBYPS-CUMMINS-0607