Is it kind of a "Shimmy" in the wheel?
I have the same issue with a 00 470 with 65,000 miles on it
Vibration felt more in the seat / floor not really in the steering wheel
My 99 LX470 just started a bad vibration at speeds 65MPH and above. 145K miles, tires balanced. Any suggestions?
Very happy about my my 95 LS. 419K miles - engine still smooth!