Steering drift problem

Hi everyone,
I'm normally pretty active Stangnetter in the Classic Tech forum, but have an issue with my daily ride that I need to figure out and fix. I have a 2000 GT that is completely stock, nothing aftermarket at this point and has 98k miles.
Problem - my steering drifts around on me when I go over small bumps at any speed (fast or slow). The tires do not exhibit any strange wear pattern, seems consistent across the entire tread. It pulls like this both left and right. My first thought was bump steer, but that usually is caused by a change in suspension geometry like lowering or bigger tires based on my limited understanding. I have also noticed some noise when driving slow with the window down that could either be brake noise or wheel bearings. I plan to pull it into the garage this weekend and take a deeper look. Any experienced this type of problem and could reccommend what I should be looking for in my inspection? My first inclination was the swaybar was lose or broken bolt, but it doesn't appear to be this (viaually). Thanks in advance!

Thanks for the reply. I will check the areas you listed. Any idea roughly what milage wheel bearings generally need replacement? Also, how difficult are uppoer/lower ball joints to replace in these cars? Special tools needed? I'll do a search for this info as well.

Update - was worn tires

Well, I inspected the front end and suspension components ans surprisingly, wheel bearings, ball joints and tie rod ends are all in good shape. Sway bar end link bushings look a little questionable, but were not failed. So I inspected the tires and they are slightly worn on the edges, sort of rounded and not flat. So I rotated the rears to the front and the steering drift problem has gone. So will eventually need to get some new tires, but problem resolved for free this time around. Might help someone else to check this before throwing money and parts to solve the problem.