I have a 2002 Ford Focus ZX5 and a while back when I turned the car on it had a small vibration while the car was cold and in reverse. After it warm up the vibrations would leave. I was told that it was probably the trans mounts that was starting to get damage. I replaced 2 out of the 3. The trans mount (new original) and the lower torque mount I put the Energy Suspension poly mount. I had brake job done on the car and was told that rotors was the problem that cause the vibration (I really doubt this could cause it). Now the vibration is really loud and strong and it only goes away while driving (either drive or reverse). While the car is stop it really LOUD.