So my 2003 GMX ENVOY XL was driving me crazy with the front clanking. I noticed that the upper arm bushings were breaking, so I decided to replace any parts that contained a bushing or ball joint. I probably didn't need to replace the bottom brackets as the original bottoms are very durable. In any case, it drives like new again. By the way, if you replace the bottom parts, you may need to replace some of the mounting screws. I had to buy a Fastenal because the corrosion when removing it hadβ¦