i have a 99 4x4 expy, today I noticed a popping sound when turning, and driving over small bumps in the road. I can also slightly feel it in the steering wheel. Does this sound like the ball joints going bad? When I drove through town it was quite annoying, but when driving back home, not a sound. Or could it be something else, struts, tie rods etc....im taking it Monday to have it looked at but want some advice before going.....thanks for any help