ok, well im driving down the road and when i tap the gas, just real fast, there is a little clunk or thud. it sounds like its coming from the driveshaft. it only does it when i tap thet gas, if i keep my foot into it, this doesnt happen.this noise also happens when i come to a stop real fast. i am wondering if it could be a u-joint or something like that?? please if anybody knows what im talking about help!!