Is there anything that can be done to stiffen up the suspension and handling on a ES350. My previous ES was fine in this department but was totaled in a hit and run. The new ES seemed great at first but now it feels more like a boat that rocks side to side if I have to make a quick correction in traffic to avoid someone hitting me. It also feels more floaty at higher speeds on the interstate almost like it's wiggling side to side. I brought it to a dealership and they say everything is fine (they didn't seem interested with it tbh) but these issues are anxiety inducing to drive with when they happen. I've seen some people mention putting RCF/GSF bushings in IS models for this issue but I haven't seen any threads of someone trying that with the ES. Any help would be greatly appreciated. Worst case scenario I'll trade the car in but I would like to keep it if possible

 

What tires are on your new ES and have you checked their pressure? What tires were on your old ES? Are both old and new the same diameter?

 

Honestly I would check for damaged wheel hubs / bearings. My previous Avalon use to do this weird wiggle thing at high speeds and turns and it would scare the **** out of me like I was going to lose control. Jack the car up and pull on each wheel side to side and see if there's any play to it. If there's a lot of movement, it could be the bearings are shot.

 

Just bounce the corners of the car. You may have bad shocks.

 

I understand your comment about "wiggling" at high speed. Wandering is another word I would use for it. I switch to sport mode and find that helps.

 

The OP has not responded in a month - there is no point in continuing this discussion.