Fleece Coolant Bypass Kit w/SS Braided Line (Manual Trans) for 2003-2007 Dodge Ram 5.9L Cummins

This is the Fleece bypass for the manual 5.9L, with stainless braided line.

It solves the classic Cummins problem: rear cylinders that run hot because they don't get enough coolant flow. That heat builds pressure that can push out freeze plugs on the block or under the valve cover. The Fleece kit adds a secondary thermostat that works on temperature, unlike other brands that work on excessive pressure, and keeps all six cylinders consistent.

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

Specs

• Line: Stainless steel braided
• Transmission: Manual
• Engine: 5.9L Cummins
• Part number: FPE-CLNTBYPS-CUMMINS-MAN-SS
• CARB EO: D-834-9

Why we run it

Pull a heavy load with a manual 5.9L and the rear cylinders take the heat. This bypass sends them the coolant flow they need, with a temperature based thermostat that keeps all six cylinders even and pressure in check. Stainless braided line and AN fittings finish it off with a leak-free, good looking install. PPEI recommends the Fleece bypass, and we run it on our own trucks.

Fitment

• Dodge Ram 2500: 2003,2005-2007 Laramie; 2003-2007 SLT, ST; 2006 Sport; 2006-2007 TRX4
• Dodge Ram 3500: 2003-2007 Laramie, SLT, ST; 2006-2007 Sport; 2007 TRX4