SKU: 39112327650

Fleece Performance 94-98 Dodge 5.9L Cummins 12V Coolant Bypass Kit

Sale price$175.39 Regular price$194.88
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Fleece Performance 94-98 Dodge 5.9L Cummins 12V Coolant Bypass KitIncreased 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

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 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. The '03-'07 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is not a fluid cooler, it was 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. All 07-13 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.

Installation Instructions
Installation Instructions
Warranty
  • 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

This Part Fits:

Year Make Model Submodel
1994-1998 Dodge Ram 2500 Base
1994-1998 Dodge Ram 3500 Base
Shipping Notes
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Exchange/Return Notes
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SKU: 39112327650

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Do it yourself
Lowell, US
★★★★★ 5
Fits ok
Size: 48W x 30L, Color: Stonewashed
Material is light weight ok for day wearing but wouldn’t use for work wear
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Reviewed in the United States on November 13, 2025
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Birmingham, US
★★★★★ 5
good pants
Size: 46W x 28L, Color: Stonewashed
Good pants
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Reviewed in the United States on January 1, 2026
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Peter J
Carnegie, US
★★★★★ 3
Light Weight
Size: 38W x 30L, Color: Stonewashed
Ok jeans for the money. Still musty smelling even after two washings though.
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Reviewed in the United States on February 9, 2026
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Tim T.
Louisville, US
★★★★★ 5
Good deal
Size: 58W x 28L, Color: Stonewashed
Good paints slit problem with shipping but fixed fast
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Reviewed in the United States on April 21, 2026
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Carnegie, US
★★★★★ 5
Wrangler
Size: 48W x 28L, Color: Stonewashed
Fit true too size
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Reviewed in the United States on October 15, 2025

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