My truck is an 05 silverado. 4x4, ext cab has about 83k on it and when im driving from around 45-65 mph there is a viberation that i can hear and feel on the floorboard. It kind of sounds like when you hit the rumble strips but no that extreme, and it goes in and out the faster you go the more it does it. i thought it was a wheel bearing so i replaced that and it still does it. i did a search and some people were saying maybe the driveshaft? but doesnt seem right with the miles and only ever pulled my motorcycle. the noise is hard to explain but its starting to be a pita! any help or input id appreciate!. thanks - - - Updated - - - also the tires are good, i even roted them to check and still had the noise in the frony.