I have recently bought a 2001 ls430 and it had a couple of minor issues which I have now resolved.
First I noticed that the drivers window would not always fully close, second the steering wheel would shudder as it would retract.
Both of these problems were fixed by some silicone spray, I used one with a straw so I could easily get it on top of the steering column and around the edge of the window frame.
I did see the steering problem on a forum and the advice was to take the steering apart and grease the parts but the spray does appear to have done the trick so far.
Hope this helps someone.