Originally Posted by Jetboy

The spring is not completely sealed in the steering rack. I don't know whether Toyota dealers can buy springs or whether the Lexus spring is the same for certain, but you definitely can access the spring in the rack. The arrow in the picture is to the cap where it is located. It may be nothing more than a bandaid to put a heavier spring in there, but that is what Lexus did. The steering racks are the same. The same part number is shared with lexus depending on model year. There are about half a dozen variations in part number that are superseded by the current version. They should all be interchangeable.

Also, if you didn't know - all GX460s have KDSS and still had the same issue, so it also does happen with KDSS.