So i'm having an issue with a loud clunking in the rear suspension or possibly the drive of my 2012 summit x. I've examined the entire track and suspension with a couple sled mechanices from the ski resort i work at but we cant find anything. nothing loose and no impact marks which i would expect with the noise I'm hearing. You can also feel it under foot when it happens. Its only a problem on whoopy trails and seems to be worse the slower you go over the whoops. i'm gonna get into the chain case next and see if anything is loose in there or in the drive but was wondering if anyone else has experianced anything simular to this problem. Thanks!