Fleece Performance fpeFPE-CLNTBYPS-CUMMINS-MAN-SS 2003–2007 Manual Transmission Cummins Coolant Bypass Kit with Stainless Steel Braided Line

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. Why do I need a Fleece 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 Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform. Cummins Coolant Bypass Kit (2003-2007 Manual Transmission) w/ Stainless Steel Braided Line

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

The Fleece Performance Coolant Bypass Kit is designed for 2003–2007 Cummins applications with a manual transmission. The kit adds a secondary, temperature-controlled thermostat to improve coolant flow to the rear cylinders, which can experience higher coolant temperatures due to limited coolant flow.

By helping maintain more consistent temperatures across all six cylinders, the bypass system lowers rear-cylinder coolant temperatures and helps prevent damaging coolant pressure buildup. Unlike systems that operate based on excessive pressure, this bypass kit is designed to address the condition based on temperature before pressure becomes an issue.

Key Features & Performance Benefits

• Temperature-controlled bypass operation: Helps address rear-cylinder cooling needs before damaging pressure buildup occurs.
• Improved coolant flow: Provides additional coolant flow to the rear cylinders.
• Consistent cylinder temperatures: Helps maintain more even temperatures across all six cylinders.
• Leak-resistant installation: Includes a stainless steel braided hose and AN O-ring fittings.

Key Product Specifications & Technical Data

• Brand: Fleece Performance
• Part number: fpeFPE-CLNTBYPS-CUMMINS-MAN-SS
• Product type: Cummins coolant bypass kit
• Application years: 2003–2007
• Transmission application: Manual transmission
• Bypass control: Secondary thermostat operating based on temperature
• Line material: Stainless steel braided line
• Fittings: AN O-ring fittings

What's Included in the Box

• Coolant bypass kit
• Stainless steel braided hose
• AN O-ring fittings

Fitment

Fits 2003–2004 Dodge Ram 2500 and 2003–2004 Dodge Ram 3500 applications with a manual transmission, as listed by the supplier.

Fitments:
2003 Dodge Ram 2500 Laramie
2003 Dodge Ram 2500 SLT
2003 Dodge Ram 2500 ST
2003 Dodge Ram 3500 Laramie
2003 Dodge Ram 3500 SLT
2003 Dodge Ram 3500 ST
2004 Dodge Ram 2500 SLT
2004 Dodge Ram 2500 ST
2004 Dodge Ram 3500 Laramie
2004 Dodge Ram 3500 SLT
2004 Dodge Ram 3500 ST
2005 Dodge Ram 2500 Laramie
2005 Dodge Ram 2500 SLT
2005 Dodge Ram 2500 ST
2005 Dodge Ram 3500 Laramie
2005 Dodge Ram 3500 SLT
2005 Dodge Ram 3500 ST
2006 Dodge Ram 2500 Laramie
2006 Dodge Ram 2500 SLT
2006 Dodge Ram 2500 Sport
2006 Dodge Ram 2500 ST
2006 Dodge Ram 2500 TRX4
2006 Dodge Ram 3500 Laramie
2006 Dodge Ram 3500 SLT
2006 Dodge Ram 3500 Sport
2006 Dodge Ram 3500 ST
2007 Dodge Ram 2500 Laramie
2007 Dodge Ram 2500 SLT
2007 Dodge Ram 2500 ST
2007 Dodge Ram 2500 TRX4
2007 Dodge Ram 3500 Laramie
2007 Dodge Ram 3500 SLT
2007 Dodge Ram 3500 Sport
2007 Dodge Ram 3500 ST
2007 Dodge Ram 3500 TRX4

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: Compliant
Carb Acknowledgement Required: false
Carb Eo Number: D-834-9
Regular Stock: t
Units Per Sku: 1