there is a bul for this one I think... ST004-04 040219 Steering/Driveline - Vibration/Drone. Sorry can't paste all info here. I intend to have my dealer work on mine next service time. I do have this issue too.
Steering/Driveline - Vibration/Drone
STEERING
ST004-04
February 19, 2004
Title
STEERING VIBRATION AND DRIVELINE VIBRATION/DRONE
Models
'03 - '04 GX 470
Introduction
Some 2003 - 2004 model year GX 470 vehicles may exhibit a steering vibration and/or a front driveline drone when operated under certain conditions. The following procedure has been developed to improve the condition.
Applicable Vehicles^ 2003 - 2004 model year GX 470 vehicles produced BEFORE the Production Change Effective VIN shown below.
Production Change Information
Parts Information
Required Tools & Material
Warranty Information
Applicable Warranty*:
This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint