All wheel drive models may develop a creaking type noise from the front suspension when driving over uneven road surfaces. Our technicians tell us revised front sway bar bushings are available which may correct this concern.Google+
Car Problem Reports
Lexus GS300 Creaking Type Noise From Front Suspension
Lexus GS300 Problem
Model Year Affected: 2006
Average Mileage: 92,222 mi (84,444 mi - 100,000 mi)
Visitor, 2006 Lexus GS300, 100,000 mi
Annoying creaking comes and goes. I've had it on the lift and lubricated everything I could see in the area. For now it has gone away but sure it will come back. I would replace the sway bar bushings for permanent fix.