My 2007 IS 350 is approaching 38000 miles; I am starting to feel the car is losing its Lexus quality firm, smooth, and solid ride (maybe because I’ve taken it to the track), the car seems to be more loose in driving and I can feel more of the road. What should I replace to bring it back to the Lexus ride?

 

Is your alignment in spec and are your tires good?

 

Provided everything is in spec, etc. I'd suggest the biggest improvement you could do to bring it back to the way it was would be to replace the shocks. They're probably the first thing to wear out, even if they aren't showing signs of leakage.

Jeff

 

Tires are good, alignment is a little out.. drifting a little to the right.

 

alignment, balance, better tires, new suspension

 

does anyone know why my rear tire has a rumbling sound? could it be the bushing before the bearing?

 

Checked your tire pressures? Even a 2 psi change, I can feel a difference in ride. Since it's getting cooler it decreases about 1 psi for every 10F/5C decrease in temperature, and it increases about 3 psi after driving, so compensate accordingly.

 

vanhousang, do you mean pulsation? Could be bearing or wheel hub assembly.