First, I don't have any direct knowledge of this problem fix but I just looked up the autopartswearhouse.com price for 8 replacement control arms with various names, for Lexus LS460 and the total came to about $757 If a qualified shop could do the work for say $130 hr and 16 hr just guessing that would be $1920. for a total of $2677. or about half of $5,000. estimate.