I have a '99 LX470 with 156K miles. Recently I notice a really loud "creaky" squeek when driving the front axle over a speed bump. The rear axle is quiet. Are there any maintenance items on the front end that should/could be serviced that may be the source of the squeek? I'm a little concerned it may be the front shocks...which have to be crazy expensive to replace with the AHS system. Thanks for the help.