I had one size that started to spin with the axle. I just removed it and reapplied a better dose of RTV and reinstalled it. It has been fine every since. Make sure to keep them greased.
03 Rubicon, NV 3550, 4" LA, UCF TT, Rear Rock Jock 60, Ultimate 44 w/Artec Truss/gussets and RCV shafts and 37" Irocks