I have not posted in here in a while since I gave my Cavy to my sister but since in the past, I have gotten lots of good help I would try seeking it again. The Cavy makes a grinding/whirling sound when going straight and it sounds louder and louder as the car goes faster. To me, it seems like the sound is coming from the rear of the car when I drive it. I replaced the front bearings and CV's about 2 years ago so I am pretty sure its not the front bearings. Have any one experienced the same type of sound/problem? I am pretty positive its the rear wheel bearings but I want to be sure. It is hard for me to take it out and check since the car is in North Carolina and I am in Ohio. I am trying to get as much information as I can so when I am back down there I can do whatever it takes to fix it. Thank you!