So I keep hearing a clunking noise when ever I accelerate hard, or brake hard. I also hear it every once and awhile when I go over a speed bump in my neighbor hood. It sounds like its coming from the rear end, but I'm not sure. I can't tell whats making the sounds. I took off the spare tire to see if it was smacking the bottom of the truck, but after I removed it I can still hear the noise. Does anyone else have this problem, or know what it could be? The only thing that I have changed to the truck so far is switch the regular lug nuts for locking lug nuts.