You have no items in your shopping cart.

Cummins Coolant Bypass Kit 03-07 Manual Transmission w/ Stainless Steel Braided Line Fleece Performance

Manufacturer part number: FPE-CLNTBYPS-CUMMINS-MAN-SS
+ -
Vehicle Fitments
DodgeRam 3500Laramie20032007
DodgeRam 2500Laramie20032003
DodgeRam 3500SLT20032007
DodgeRam 2500SLT20032004
DodgeRam 3500ST20032007
DodgeRam 2500ST20032004
DodgeRam 2500Laramie20052007
DodgeRam 2500SLT20062007
DodgeRam 2500Sport20062007
DodgeRam 3500Sport20062007
DodgeRam 2500ST20062007
DodgeRam 2500TRX420062007
DodgeRam 3500TRX420072007

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.

  • 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 and up include billet hose brackets.

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.
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.
Products specifications
Country of OriginUSA
Sold AsKit
Core ChargeFalse
Engine ManufacturerCummins
Fuel TypeDiesel
Liter5.9 Liter, 6.7 Liter, 5.9 Liter, 6.7 Liter
Transmission TypeManual
Youtube Video
Proposition 65 Warnings

CALIFORNIA WARNING: Cancer and Reproductive Harm

Write your own review Close Review Form
  • Only registered users can write reviews