Fleece Coolant Bypass Kit w/SS Braided Line (Auto Trans) for 2003-2005 Dodge Ram 5.9L Cummins
FPEFPE-CLNTBYPS-CUMMINS-0305-SSEver had a freeze plug let go on the back of a Cummins? The Fleece coolant bypass is how you keep it from happening on your 2003-2005 automatic.
The rear cylinders on the 5.9/6.7L Cummins don't get enough coolant flow, so they run the hottest. That can build excessive pressure in the cooling system, especially at the rear of the block, and blow out freeze plugs externally or the smaller plugs under the valve cover. Fleece's bypass adds a secondary thermostat that, unlike other brands, works based on temperature instead of excessive pressure, so it solves the problem before pressure becomes an issue.
Fleece calls the bypass one of the most important additions you can make for the reliability and longevity of the Cummins platform. This version uses stainless steel braided line.
Benefits
- Lowers coolant temperature at the rear cylinders
- Ensures consistent temperatures across all six cylinders
- Prevents damaging coolant pressure build up
- Secondary thermostat that works on temperature, not excessive pressure
- Braided hose and AN O-ring fittings for a leak-free install
- Billet hose brackets included on kits for MY 2003+
Note: The 2003 - 2007 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.
Specs
- Line: Stainless steel braided
- Transmission: Automatic
- Engine: 5.9L Cummins
- Part number: FPE-CLNTBYPS-CUMMINS-0305-SS
- CARB EO: D-834-9
Why we run it
Your rear cylinders stop running hotter than the front ones. The Fleece bypass adds a second thermostat that opens on temperature, not pressure, so coolant temps stay even across all six cylinders and pressure never builds to the point of pushing out a freeze plug. The stainless braided line and AN O-ring fittings make for a clean, leak-free install. PPEI recommends this bypass, and we run Fleece bypass kits on our own Cummins trucks.
Fitment
- Dodge Ram 2500: 2003,2005 Laramie; 2003-2005 SLT, ST
- Dodge Ram 3500: 2003-2005 Laramie, SLT, ST
Couldn't load pickup availability
WHO IS THE TUNER/CALIBRATOR
PPEI, also known as Power Performance Enterprises, Inc., is led by the business owner and lead calibrator/tuner Kory Willis. PPEI began calibrating/tuning back in 2008, specializing in Diesel Performance but has since expanded into the Gas and Powersports industries. Kory and the team at PPEI have set many world records along with continuing many industry “firsts”. We take pride in knowing that Kory not only prides his work, but also thoroughly enjoys setting expectations high for our team so our customers can have the best products available in the world.