mine did the same thing, just rocking the rzr side to side would make is squeak like crazy. i tried to greasing the swaybar and all the fittings. didn't help. then i pulled the shocks off, took apart the bushings and cleaned and put a thin layer of grease all over them. fixed it, haven't had a problem since, guess i'll make it a yearly thing. hope this helps, worked great for me, also check the swaybar mount bolts, mine were loose, along with alot of other stuff on my rzr.