"thump" sensation in steering column...

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hello, all.

there's been a couple postings re: the front suspension (ie noises, vibrations), recently. i didn't post in either of those as my question varies slightly.

as of late, i have felt a "thump-like" sensation in the steering column/wheel upon going over bumps. this will happen at any speed but is felt a bit more if speed is quite low (ie. going over a speed bump), since the rest of the car is stable. i seem to notice this more, when the right (passenger side) is the first to encounter the bump(s). also happens, if i move the steering wheel slightly to the left or right while the car is idle. any ideas? hope my description is enough. VX suspension is stock and she just turned 30K yesterday.

i am thinking of taking her in next week to have it looked at. although the tech is awesome, i'd like to go in w/ a bit of knowledge to have as much checked to alleviate this malady.

thanks!

-joe