Hello Gonk 24...Were you able to isolate or pinpoint the problem? I am having similar problems with my 2002 Grand Prix. I have changed the transmissioin mount, drivers side CV halfshaft, and I am soon going to change the ball joints along with the passengers side CV halfshaft. I hope that I don't have replace the hub bearing assembly. The bearing on the drivers side felt very tight and that is where I am feeling the most vibrations.(DRIVERS SIDE FLOOR BOARD)

Cray...