DO NOT BUY BORGESON! problem comes back in about 4-6 mths. if you have to, buy NAPA, their design is completely different from OEM. it's flat on two sides.
grab your steering wheel on the top and shake vigourosly. If it cluncks, we share same problem - loose bearing in the connection or something, I just live with it.
do not replace parts - and pay for that - based on sweet talk or "it sounds like" assurances.
this is what you need to do:
1. check out your idler arm
2. check out your pitman
3. check out both hub bearings
I, personally, had to replace idler, then driver side hub. for 2003 and infamous GM quality, your hubs are about to go bad. Mine is 2000, but I bought it with only 58K miles, which is about same mileage you should have.
if you have at least some hand skill, idler takes about 25 minutes to replace. hub bearing, a single unit with hub, about same. pitman is said to require steering gear removal, unless you have racknpinion steering, so you don't have idler and pitman. good for you.