I have a 2005 GX470 with the KNDS system and have an issue that the dealer has not fixed yet correctly. The driver side rear whell lip is 1.5 inch higher than the passenger side. Has anyone had this problem? So far Westside Lexus has replaced the driver rear shock and this still not fixed the problem. Thanks for any Help. Pat

check out your rear axle both rear wheel carrier arm bushings

The KDSS can cause that too.

Try another dealership. My 06' GX470 was riding rougher than my 1993 4-Runner with over 200,000 miles and my local Lexus dealership said there was nothing wrong. I took it to another dealership the next week and they reset the suspension … now it has worked fine for over 6 months.

Maybe a sensor in one of the rear air shocks. Others have posted problems with the sensors. If this is the problem, simply replacing the sensor fixes the problem.