Fleece Performance Coolant Bypass Kit With Stainless Steel Line For 98.5-02 5.9L Cummins steering and proper suspension geometry

and proper suspension geometry

dish and center profile

Crew Cab and Quad Cab Models

innovative and industry-leading offset spacer design

Engineered to clear 37-inch tires while maintaining drivability and comfort

Fleece Performance Coolant Bypass Kit With Stainless Steel Line For 98.5-02 5.9L Cummins steering and proper suspension geometryThe 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