usedname, before you set your car on fire due to harshness of ride, tell us about your tires, size and brand. I have 16 in wheels and tires on my LS400 and 18 inch wheels and tires on my '05 LS430 and there is a very noticeable difference in the ride between the two cars - the LS400 being MUCH softer, less harsh.

 

Yes I replaced the LCA no. 2 bushings with the ISF versions about a year ago.

Tires Pirelli Cinturato P7 A/S Plus II, are the standard size 225/55 R17with less than 2 years/20k miles on them, with 6-7 tread left, evenly worn. I wouldn't be trying to get to some mythical level of quietness if I didn't already experience it with these tires on this car. The car was very quiet. The increased road noise started after I had a near-accident (no collision), causing me to brake very hard, and this resulted in the struts popping a leak. Since then I've had more road noise even though I replaced the struts, the LCA bushings, and now, every other rubbery thing up front. I guess I haven't replaced the wheel hubs, but thse noise is not directly proportional to speed on quiet pavement. It's increased harshness and noise related to crap roads, relative to before. So I don't know. Struts and wheel hubs are the only things left...

 

If you can post a picture of the cam bolts on the LCAs. Maybe the shop has the alignment report on file and can email to you. If there are adjusted too far either way that can alter how the suspension articulates. So after the strut leaked did you replace it? It could have lost compression or rebound damping.

 

Yes I replaced both fronts with KYB Excel Gs. Will get photos and check with the shop.

 

If everything checks out with the alignment and you torqued all the bushings at ride height, I would just allow a few thousand miles for the new struts to settle. If you are still not satisfied with the ride the next step might be to try OE Lexus struts.