I know a few people with 99+ Silverado's and they all seem to have a clunking noise in the drivetrain that occurs after you take off from a start. All of the trucks that do it are 4wd and the only person that I know with a 2wd doesn't have the problem. I was curious if anyone else has similar problems. My brother took his truck to the dealer and they told him that he needs a new slip yoke ($250). I would think that Chevy would have a recall if all of their 4wd trucks are like this.