could be the shock bushings, or could even be the swing arm bearings ?
if you can get the noise to happen by pushing down on rear rack to work/move the shocks like, try pin pointing the sound better?
spraying them with some oil, one at a time till noise stops can help you find it too!
if you can get the noise to happen by pushing down on rear rack to work/move the shocks like, try pin pointing the sound better?
spraying them with some oil, one at a time till noise stops can help you find it too!