Fleece Performance Manual Transmission Cummins Coolant Bypass Kit w/ SS Braided Line - Dodge Ram 2003-2007 (6.7L)

Fits 2003-2007 Dodge Ram 2500 and 3500 models equipped with manual transmissions (6.7L).

The rear cylinders on the 5.9L and 6.7L Cummins engines often suffer from restricted coolant flow, leading to the highest operating temperatures at the back of the block. This thermal imbalance can cause excessive pressure to build, potentially blowing out external freeze plugs or the smaller diameter plugs located under the valve cover. The Fleece Performance coolant bypass kit addresses this vulnerability by adding a secondary thermostat. Unlike other kits that rely on pressure alone, this system is temperature-actuated, opening to ensure consistent coolant flow across all six cylinders before pressure becomes a problem.

This kit improves the long-term reliability and cooling efficiency of the Cummins platform, protecting the engine from catastrophic failure during high-load or over-temperature conditions. Each kit includes a high-quality stainless steel braided hose and AN O-ring fittings to ensure a secure, leak-free installation.

• Lowers coolant temperatures at the rear cylinders
• Ensures consistent thermal profiles across the entire engine block
• Prevents damaging pressure buildup and freeze plug failure
• Includes stainless steel braided line and AN O-ring fittings
• Temperature-based thermostat operation for proactive cooling
• Manufacturer Part Number: FPE-CLNTBYPS-CUMMINS-MAN-SS