One problem related to automatic transmission has been reported for the 1998 Buick Lesabre. The most recently reported issues are listed below.
When turning the steering wheel the wheel appears to click or knock. This begam shortly after I had the vehicle in to have the transmission repaired as it was shuddering after stopping and starting. I contacted the service people at the boise larry miller Buick place, where I had transmission fixed. I was told it was not serious and they would check it when I brought it in for service. But it concerns me, and I need to know if it is serious.