My 328 drives great, no slop in the wheel, no wandering and it stops straight with the hands off the wheel, corners great BUT! when it catches a rut in the freeway it will change lanes faster than Britney changes boy friends.

What is the most common cause/failure on this suspension design to be so sensitive to the ruts in the freeway but no where else?

I know what sloppy ball joints feel like and play in a steering rack so....?

I've been to RealOEM so I can see a number of possibilities, just need to be steered in the right direction.

Thanks, DJ