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.
Fleece Coolant Bypass Kit For 2006-2007 Dodge Ram 5.9L Cummins Diesel Automatic
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Fleece Performance Coolant Bypass Kit For 2019-2022 Ram 6.7L Cummins Diesel
Fleece Performance Coolant Bypass Kit For 2013-2018 Ram 6.7L Cummins Diesel