Fixed 1 problem, now a new one appears

[Blk97GT]

So I went ahead and replaced my broken trans mount and U joint and my car was riding real smooth with no more noises.....so I thought. Now the car has developed a horrible grinding sound from under the car, sounds like its coming from the driveshaft. We bolted it back up nice and tight,thought everything looked fine. Could we have installed the driveshaft wrong? What should I look for? Just want my car to ride smooth and not make any noise, this is getting crazy. Any help would be great,thanks.

 

[Willis_98GT]

put your hand on the ebrake when your driving and its making the noise. you may be rubbing the cable..