V8 Steering Vibration

[KeithOlb@worldnet.att.net (Keith R. Olbrantz)]

 My 1990 V8 (56,000 miles) has recently developed  some vibration in the
 steering wheel after especially  after a cold start. It is especially
 noticable going uphill.  I notice it most with tiny steering corrections.
 Rotating tires did not help. Hydralic fluid level OK.  Dealer did not find
 anything on inspection.: Tire dealer inspected tires and found no problem.
  Any suggestions on where to look? Right now it is more annoying than a
serious problem, but I sure want to avoid any major repairs onthis car in
the future.