but also when your underneath it, go ahead and check the u-joints, since what you have been explaining sounds like what my u-joint did in my truck one day, I was backing out of my driveway and I heard that didn't think anything if it until I start driving it more and more and I got tired of the noise one day went and checked underneath it and I actually bent my u-joint
you are gonna make sure your tires aint going to move first, so put a block of wood or something behind a rear tire and do the same thing for the front and than what your gonna do is, put it in N and crawl underneath it, if you can, grab hold of the driveshaft firmly and start twisting back and forth and listen for any clunks, but you can also visually inspect it also while your under there and just for safe check the u-joints by hand also the one connected to the trans and the one connected to the pumpkin, and just make sure there is a gasket around each one and if there is a gasket make sure there is nothing poking out of it like a needle bearing
Did they are tight, tried the method where you put it in drive then reverse and got a pretty loud clunk. Took a video as well. My drive shaft moves quite a bit even though I'm applying the brake c http://i654.photobucket.com/albums/...8-8FB9-958EF89DD496-6252-0000057186080FA4.mp4
I cant really tell by that or not, but when your applying the brake and going through gears it will move a bit like it did in the video