I'm pushing 115K an am going to be replacing the lowers with some homemade billet arms sometime soon. I'm sure the upper bushings need replaced but how about the ams themselves? I want to go with poly bushings in all four arms and I've heard changing the bushings can be a beatch. If I'm not mistaken a new set of uppers is about $60. I'll just switch out the bushings unless someone says there is a good reason to change the arms too.