First post and I'm flummoxed. I have an 2009 Lexus RX350 AWD. At speeds of 70-75 one can feel the steering wheel vibrate fast. At 80mph(for testing purposes) it largely disappears. Back down to 65 the vibration in the steering dissapates greatly but one can still feel the front wheels shake. I've done the following:
New tires. I had them rebalanced three times. A fourth time at an independent shop. No improvement. Went back to the original store and had them put on two new front tires on the off chance it might be a bad set of tires. Had them road force balance them too. No improvements.
Replaced rotors, brakes, entire front strut assembly along with lower ball joints. Also replaced steering column. Alignment done after that.
Took it for a drive today and no improvement. Full disclosure: My mechanic at the outset said I didn't need new ball joint or struts as the whole suspension looked new almost. So I'm stuck as he is too. Not sure what to do without throwing money at this problem. Did the 12-6 & 9-3 tire test and the wheels don't jiggle or move at all. Could it be a bad set of rotors? This didn't happen while I had my old tires & rotors on them prior to replacement.
Any ideas? Thanks.