it is a 4x4. the noise doesnt go away until the truck is at a complete stop. i thought it would be the wheel bearing at first but it doesnt change when i turn or step on the brakes. it just keeps going until it comes to a stop. its is the loudest at abotu 35 and sort of gets quieter when slowing down. once i get above about 45 i cant really hear it to good anymore but the stacks sort of over power the noise haha
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2004 2500 cummins 6 spd. quad cab. triple piller gauges, rest stock