I have a 2010 Silverado (4wd) and I have 33s, mud tires that have been on here only for a few months. I have this awful vibration/shaking and terrible road noise...honestly sometimes it feels like a damn flat tire. I know it's not from the tires though because for a while it didn't do this. And since this started I've had to replace my front ball bearings and my cat and they looked at it and said they couldn't find anything else wrong that's making it do that. I've looked through several threads and taken it to multiple mechanics and they can't figure it out. At first thought maybe wheel bearings but those are good after all....any ideas? It's absolutely killing me