well i dont know if its like this for all you guys, or if the fact that its solid rearend. but when i go over dips or speedbumps as soon as the rear end hits it makes a loud thud noise like i just bottomed out the suspesion or something, i have brand new shocks so i know its not that. sounds like a 400lbs chick is sitting on the back of my car

 

Make sure that your exhaust is not hanging, and banging against the axle.