I have a 2006 GS300 and it is making this noise that can be described as a repeated "clunking" at the same intervals.. BUT it only happens when I am backing up and turning the steering wheel almost all the way to either direction. It doesn't happen when the vehicle is moving really really slow though.

I've done some research and some people have reported similar issues, but grinding noises vs clunking. The mentioned that it might be some wheel bearing issues. But i'm not sure so i'm running it by you cool guys.

 

Doesnt sound like a wheel bearing, you will hear a wheel bearing driving straight. But the sound will change if you move the steering wheel.

Sounds to me you may have a tie rod or a ball joint thats making the noise. I would take it to an alignment shop and have them inspect it.

Also at times you could get a clunk sound if one of your front axles were going bad.

 

Sounds good, thanks for the update. I'll have a shop take a look at it.