I recently diagnosed and fixed a sound I would describe as a crunch, grinding, rattle, or clunk (trying to hit as many search terms as possible) in the front suspension on my 2008 AWD CTS. It was noticeable below 40MPH over small road imperfections, particularly those that affected only one side. I've had a broken stabilizer bar link on a previous car, and it sounded very similar. I noticed the stabilizer bar links were turned against the stops, so I rotated them back to center. The noise seemed gone or greatly reduced, but a day or so later, it was back. The links were again turned against the stops, so I rotated them back to center, which quieted them once more. I wasn't able to immediately identify any other problem with them. I installed MOOG's "problem solver" links with grease fittings and wrench flats, and the problem is fixed.
I couldn't find a similar story, so I thought I would add my experiences, and hopefully save somebody from premature control arm replacement or other costly guesses.
I couldn't find a similar story, so I thought I would add my experiences, and hopefully save somebody from premature control arm replacement or other costly guesses.