For about the last month or so, there has been a noise coming from what appears to be the front left side when coasting at between 10-40km/h. The noise can sometime be heard when accelerating but easiest to reproduce when coasting. The noise is difficult to explain but its basically a grrrr grrrr grrr. You can feel the grinding through the pedals and floor. It sounds like the dull groan of a huge base speaker making a car vibrate. When it first started, I looked under the vehicle and saw the left CV boot was torn and grease was coming out. I had replaced the right side a while ago so decided to replace the entire CV on the left side. After doing this, the noise was gone for about a week and I thought that was that... until a few days ago when it started again. I have driven with the front prop only and the sound persists. Rear prop only and the sound persists. Changing to neutral when coasting also make no difference. I have visually inspected all the break pads and disks and they are all perfect. Today I stripped down the front hubs to inspect the wheel bearings and although I have not put it all back together yet, I dont think it will make a difference as all the bearings and needle bearings have no pitting or roughness. Any suggestions as to where to look next or how to diagnose?