Hello Shawn, I know that this is an old topic But Im a new member and I have a 98 GS300 and I was doing a google seach under lexus gs front end niose and came across this link to this fourm, I think my car has the same problem as yours.
I would like to know if you came up with a conclusion? I also think what could of cause the problem is that we both have custom wheels yours being 19s and mines are 20s that could of played a role in shorting the front end life span of the suspension.
My drivers side front wheel is where the niose is coming from, like a grinding metal bending ratteling and creaking noise, it happens while driving the car for at least a mile or longer, when I turn the steering wheel it just scares the crap out of me!, makes you think the wheel is going to fall off, I did discover that I have bad shocks for starters, I know it's not the brake calipers, pads nor the rotors and not the wheel bearing either and not the rack and pinion I have ruled all that out and made sure of that!, hoping you or someone can help, Thanks!!