1991 Mercury Topaz Grinding like noise

I have a grinding like noise in the front of my car when I drive it. Doesnt happen when I am stopped. Sometimes it happens when I am turning but not much, It seems to come and go. Sometimes its worse than other times. I checked the auto trans fluid to see if it might be low and it was fine. I dont know if its the axle or the trans. I know its in the drivetrain. Sometimes it seems like its more on the right but I could be wrong. No leaks underneath, thought it might be like a plastic piece underneath like hitting the wheel, but I cant see anything. I dont have a picture of anything because I dont see anything wrong. Oh and it doesnt do it when put into gear or when I start the car. I am thinking its the bearings or the engine mounts failed. But I looked at the engine and couldnt you tell if they have failed? I am most likely thinking its the bearings since the breaks are fine and it doesnt just do it when the breaks are applied, the breaks have no affect on it. Let me know what you think.