Fleece Performance Coolant Bypass Kit for 2003-2005 Dodge Ram 2500/3500 (5.9L / 6.7L) FPE-CLNTBYPS-CUMMINS-0305

Fits 2003-2005 Dodge Ram 2500 and 3500 trucks (5.9L / 6.7L) equipped with automatic transmissions.

The rear cylinders on the Cummins 5.9L and 6.7L engines often suffer from restricted coolant flow, resulting in significantly higher temperatures at the back of the block. This heat soak can cause excessive pressure buildup, leading to blown external freeze plugs or the failure of smaller plugs located under the valve cover. The Fleece Performance Coolant Bypass Kit addresses this design flaw by adding a secondary thermostat. Unlike pressure-relief systems, this kit operates based on coolant temperature, ensuring consistent cooling across all six cylinders and preventing pressure spikes before they cause damage.

This specific kit for 2003-2005 automatic transmission models is designed to eliminate the factory transmission fluid heat exchanger. This is an essential upgrade for high-horsepower applications or trucks operating in warmer climates where the factory heater-assisted warm-up is unnecessary. The kit features high-quality AN O-ring fittings and braided hoses to ensure a leak-free seal and includes billet hose brackets for a clean, professional install.

• Lowers coolant temperatures at the rear cylinders to improve engine longevity
• Secondary thermostat ensures consistent temperature across the entire block
• Prevents damaging pressure buildup that leads to blown freeze plugs
• Complete kit includes braided hose and AN O-ring fittings
• Includes billet hose brackets for a secure installation
• Replaces manufacturer part number: FPE-CLNTBYPS-CUMMINS-0305