Where should I start troubleshooting the problem of a vibration noise that is coming from driver's side front on 91 Ford F-150 4x4?
I have a growling vibration noise in the location of driver's side wheel area. It starts at about 25-30 mph, but stops when I stop and usually starts up again at same speed. It's very loud, and won't do it at all sometimes, but mostly it will.