I have a 2001 Nissan Xterra that I have replaced the ball joints, tie rod ends, and upper control arms. I had it aligned, and after about 500 mile you can start to feel that it has worked its way out because it starts to feel like it is 4 wheel drive when you turn the wheels sharply like backing out of a parking lot. It is wearing the front tires on the outer edges. Does anyone have any idea what could cause this? One more thing is all parts were replaced using MOOG.