Power Steering Rack-Bad? (03)

[WRGREENER]

Can anyone describe to me how you can discern if your power steering rack is bad or in need of replacement? I have replaced: Drop-links, control arm, inner/outer tie rods, "wishbone" balanced & aligned and still get a intermittent "bump" vibration when on a rough hwy. kinda like when a steering dampener is bad...smooth>>> shimmy>>>smooth. i am told shocks are good? any thoughts

[BYprodriver]

Steering rack usually leaks oil&/or torn boots if bad. "Bump" vibration is usually from a bent wheel. Does this happen at a certain speed range? If so that usually means tires out of balance, always check tires for correct air pressure.

[WRGREENER]

OK, no leaks. that eliminates one item. speed is not relevant. usually happens on bad road surface. wheels, balance, pressure-perfect. will have to find a good shop. thanks