Fleece Coolant Bypass Manual Transmission (FPE-CLNTBYPS-CUMMINS-MAN) for 2003-2007 Cummins 5.9L
$376.95
The Fleece Coolant Bypass for Manual Transmission (FPE-CLNTBYPS-CUMMINS-MAN) is an aftermarket upgrade for 2003–2007 Dodge Ram trucks with 5.9L Cummins diesel engines and manual transmissions. It improves coolant flow to the rear engine cylinders, addressing overheating issues and enhancing engine longevity. Designed for durability and easy installation, the kit includes all necessary components and is favored by Cummins owners for boosting performance and reliability.
The Fleece Coolant Bypass for Manual Transmission (FPE-CLNTBYPS-CUMMINS-MAN) is a high-performance aftermarket upgrade designed specifically for 2003–2007 Dodge Ram trucks equipped with the 5.9L Cummins diesel engine and a manual transmission. This coolant bypass kit addresses a common issue in Cummins engines where the rear cylinders receive inadequate coolant flow, leading to elevated temperatures and potential long-term engine damage. By rerouting coolant from the rear of the engine, the Fleece bypass ensures more balanced temperature distribution across all cylinders, improving thermal management and engine longevity. Engineered for durability and easy installation, it includes all necessary hoses, fittings, and hardware, making it a popular choice among Cummins enthusiasts seeking improved reliability and performance in demanding conditions.
| Weight | 15 lbs |
|---|---|
| Dimensions | 12 × 9 × 4 in |
Fitment
- 2003 Dodge Ram 2500/3500 5.9L 24V Cummins
- 2004 Dodge Ram 2500/3500 5.9L 24V Cummins
- 2004.5 Dodge Ram 2500/3500 5.9L 24V Cummins
- 2005 Dodge Ram 2500/3500 5.9L 24V Cummins
- 2006 Dodge Ram 2500/3500 5.9L 24V Cummins
- 2007 Dodge Ram 2500/3500 5.9L 24V Cummins
Features
Increased Coolant Flow, Decreased Coolant Temperatures
The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.
Benefits:
- 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. Kits for MY 2003+ include billet hose brackets.
Why do I need a Fleece Performance Coolant Bypass?
One of the biggest issues on the 5.9/6.7L Cummins is the coolant flow problem 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 make to improve the reliability and longevity of the Cummins platform.
*US Trademark Reg. No. 6099979, 6099980, 6099981 and 7659022.
Application Notes
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. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed.
For model years 2007 – 2018 6.7L trucks, including both automatic and manual equipped transmissions, factory installed transmission fluid heat exchangers are uncommon. For customers with a 6.7L that has a heat exchanger, a heater tube can be purchased at your local Chrysler Dealership [PN:68048997AA] to complete the installation.
