Fleece FPE-CLNTBYPS-CUMMINS-0305-SS Coolant Bypass Kit for 2003-2005 Dodge Ram 5.9L Cummins Auto Transmission with Stainless Braided Line

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Part #: FPE-CLNTBYPS-CUMMINS-0305-SS UPC: 670875715059
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Installation Instructions

Fleece Coolant Bypass Kits FPE-CLNTBYPS-CUMMINS-0305-SS Details

One of the biggest issues on the 5.9L Cummins is the lack of coolant flow to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition.  The Fleece Performance Coolant Bypass is one of the most important additions you can make to improve the reliability and longevity of the Cummins platform. It adds a secondary thermostat to the cooling system, ensuring consistent temperatures across all six cylinders and preventing over-pressure issues.

Key Features

  • Lowers coolant temperature at the rear cylinders
  • Ensures consistent temperatures across all cylinders
  • Prevents damaging coolant pressure build up
  • Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation
  • 1 Year Limited Manufacturer Parts Warranty


Note: The 2003 – 2007 Dodge Ram 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed.


This product can expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
California Proposition 65 Notice
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