noises in the diff or slipper..? very easy to rebuild or maintenance work. there was nothing wrong with the DIFF at all so we just cleaned it up and resealed with new gasket and oil. the oil was low so I would do an inspection anyways just to keep this part full. slipper was getting loose and could not see why till I spun it and heard the bearing grind and saw the wobble, which puts bad play and wear on other parts. cleaned and put new bearings on. what a difference and we couldn't even see any wear on the bearing which tells me it is bad inside due to a severe landing or impact probably hurt the bearings and tweaked its trueness. problem solved back in action..be sure to use the oil weight for your style of driving . the thicker the oil the more positive it is..less weight than its more loose on take off .