Yesterday my car developed a bad vibration out of nowhere. When driving the car the vibration can be felt from under the car, sterring wheel dont shake but everything else does. Vibration is felt in every gear but not so bad on the HWY. My motor mounts where changed a few months back so those are good. I can rev the motor in nuetral and it is very smooth, car also shifts smooth. Could this be the U joints? Maybe trans mount? If it is the U joints how can I tell they are bad just by looking at them? Also this vibration seems tomake the car work harder to go, its not pulling as hard as it use to, feels real slugish.