My 97 had the same thing (I sold it in 99, so im going back in time here a while) but there was a "ball bearing bushing" (as the tech described it) in the column that had gone bad.
I had to literally yell and throw things in the dealership to get any action finally they had one tech who spoke up and said he heard it and had the same problem with his DD. Needless to say they were less than happy about the time and cost associated with the "minor" repair but they did fix it...
I know this is of ZERO help since I dont remember the part name, or know the process but hopefully it points in the right direction.
It woul be an easy fix if not for the damn AB